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    PRAIRIE BAND OF POTAWATOMI  INDIANS v. KARLA PIERCE
                                            FILED
                               United States Court of Appeals
                                        Tenth Circuit
      
                                         JUN 25 2001
      
                                       PATRICK FISHER
                                            Clerk                                      PUBLISH
             
                               UNITED STATES COURT OF APPEALS
             
                                       TENTH CIRCUIT
             
             
             
             PRAIRIE BAND OF POTAWATOMI  INDIANS,
                                              
                       Plaintiff_Appellee,              
                                              
    
                  v.                                          No. 99_3324
                                              
    
             KARLA PIERCE, Secretary of  Revenue, State of Kansas; SHEILA  WALKER, Director of Vehicles, State  of Kansas; and DON BROWNLEE,  Superintendent, Kansas Highway  Patrol,
                                              
                       Defendants_Appellants.           
                                              
         
             
             
                        APPEAL FROM THE UNITED STATES DISTRICT COURT
                                 FOR THE DISTRICT OF KANSAS
                                 (D.C. NO. 99_CV_4136_DES)
             
             
             
             John Michael Hale, Kansas Department of Revenue, Topeka, Kansas (M.J. 
             Willoughby, Office of the Attorney General, Topeka, Kansas; Richard L. Cram, 
             Kansas Department of Revenue, Topeka, Kansas, with him on the briefs) for the 
             Defendants_Appellants.
             
             David Prager III, General Counsel, Prairie Band of Potawatomi Indians, Mayetta, 
             Kansas, for the Plaintiff_Appellee.
             
             
             
             
             
             
             
    
     
             Before EBEL, HENRY, Circuit Judges, and WEINSHIENK, District Judge.(1)
             
             
             
             HENRY, Circuit Judge.
             
             
             
             
    
                  Seeking to have its motor vehicle registrations and titles recognized by the 
    
             state of Kansas, the Prairie Band of Potawatomi Indians, a Kansas Indian tribe, 
    
             filed suit against various Kansas state officials pursuant to the Indian Commerce 
    
             Clause, the Kansas Act for Admission, and other federal law.  During the 
    
             proceedings below, the district court issued a temporary restraining order 
    
             ("TRO") and thereafter a preliminary injunction, each of which prohibited further 
    
             enforcement of the state motor vehicle registration and titling laws with respect 
    
             to vehicles registered and titled by the tribe.  The state officials then filed this 
    
             interlocutory appeal, challenging the preliminary injunction on various grounds. 
    
             We affirm for the reasons set forth below.
    
             
    
                                       I.  BACKGROUND
    
    
    
    
    
             (1)     1  Honorable Zita L. Weinshienk, United States District Judge for the District of 
             Colorado, sitting by designation.
             
     
             
             
             
                  The Prairie Band of Potawatomi Indians (the "tribe") is a federally 
    
             recognized Indian tribe with a reservation located in Jackson County, Kansas.  On 
    
             March 16, 1999, as a response to "a significant increase in the amount of motor 
    
             vehicle traffic on the reservation," the tribe enacted its own motor vehicle code. 
    
             Aplts' App. vol. I, at 16 (Prairie Band Motor Vehicle Code ("PBMVC") Ch. 17_
    
             1).  The purpose of the code was "to implement reasonable rules, regulations, and 
    
             penalties essential to maintaining a safe transportation system within the [tribal] 
    
             jurisdiction."  Id.
    
                  Under the code, tribal registrations and titles are required for all vehicles 
    
             owned by the tribal government and for all vehicles owned by tribal members 
    
             who reside on the reservation.  See PBMVC § 17_10_1(B).  Registration involves 
    
             "the act of assigning a registration plate [i.e., a license] and validation sticker(s) 
    
             to a vehicle, and to renew the same."  Id. § 17_10_2(H).  Titling involves, among 
    
             other things, proof of ownership.  See id. Ch. 17_10 (noting "the issuance of 
    
             certificates of title for conveyance of ownership"); see also id. § 17_10_19 to _35 
    
             (various tribal statutes on certificates of title).  A certificate of title "is a 
    
             prerequisite to registration of [a] vehicle."  Id. § 17_10_4(D).
    
                  Prior to the enactment of the tribal motor vehicle code, the tribe and its 
    
             members complied with the motor vehicle code of Kansas.  Under the state code,
             
     
             
             
             
             all vehicles that operate in Kansas are required to have registrations and titles 
    
             issued by the state.  See Kan. Stat. Ann. § 8_142.(2)  Violators may be cited and are 
    
             subject to imprisonment and/or a fine.  See id.; see also id. § 8_149.  Gratefully, 
    
             an exception is made for nonresidents.  Nonresidents who operate vehicles in 
    
             Kansas are not considered violators if they are properly registered and titled in 
    
             the state of their residence and if the state of their residence grants reciprocal recognition to the registrations and titles of Kansas.  See Kan. Stat. Ann. § 8_
    
             138a.(3)
    
                  On April 27, 1999, approximately a month after the enactment of its motor 
    
             vehicle code, the tribe issued its first registration and title to a tribal member by 
    
             the name of Vestina Nonken.  See Aplts' App. vol. I, at 104 (affidavit of David 
    
             Danielson, tribal motor vehicle registrar).  Having received indications from state 
    
             officials that tribal registrations and titles would not be recognized outside the 
    
             reservation, the tribe apparently hoped that Ms. Nonken would be cited so that a 
    
             challenge could thereby be made to the state motor vehicle registration and titling laws as applied to the tribe and its members.  For two months, the tribe asked 
    
             various state officials to cite Ms. Nonken, but no citation was ever issued.
    
                  Thereafter, during the week of June 28, 1999, the tribe proceeded to issue 
    
             more registrations and titles.  See id. vol. III, at 8 (counsel for tribe at TRO 
    
             hearing) (stating that by June 1999 there were approximately twenty tribal 
    
             registrations and titles in use).  For more than a month, these registrations and 
    
             titles remained unchallenged by the state.  It was not until August 7, 1999, 
    
             approximately three months after the first registration and title was issued by the 
    
             tribe, that a tribal member was finally cited for using a tribal registration and title 
    
             outside the reservation, a purported violation of Kan. Stat. Ann. § 8_142.  See id. 
    
             vol. I, at 158 (citation issued to Joseph P. Rupnick).  Two more citations and a 
    
             warning ticket were subsequently issued, all during the first two weeks of 
    
             September 1999 and all pursuant to § 8_142.  See id. at 157, 159, 160 (citations 
    
             or warning tickets issued to Willie J. Potts, Nathaniel J. Potts, and Joseph H. 
    
             Mattwaoshshe).  Of the three citations, two were ultimately dismissed and the 
    
             last resolved by payment of a fine.  See Aplts' App. vol. III, at 11 (counsel for 
    
             tribe at TRO hearing); id. at 103 (counsel for tribe at clarification hearing).  
    
             
    
             (2)  Section 8_142 provides in part:
             
                  It shall be unlawful for any person to commit any of the 
             following acts and except as otherwise provided, violation is subject 
             to penalties provided in K.S.A. 8_149, and amendments thereto:
             
                  First:  To operate, or for the owner thereof knowingly to 
             permit the operation, upon a highway of any vehicle, as defined in 
             K.S.A. 8_126, and amendments thereto, which is not registered, or 
             for which a certificate of title has not been issued or which does not 
             have attached thereto and displayed thereon the license plate or 
             plates assigned thereto by the division for the current registration 
             year, including any registration decal required to be affixed to any 
             such license plate pursuant to K.S.A. 8_134, and amendments 
             thereto, subject to the exemptions allowed in K.S.A. 8_135, 8_198[,] 
             and 8_1751a, and amendments thereto.
             
                  Second:  To display or cause or permit to be displayed, or to 
             have in possession, any registration receipt, certificate of title, 
             registration license plate, registration decal, accessible parking 
             placard or accessible parking identification card knowing the same to 
             be fictitious or to have been canceled, revoked, suspended or altered.
             
             Kan. Stat. Ann.  8_142.
             (3)  Section 8_138a states that:
             
                  The provisions of this section shall apply only to the 
             nonresident owner or owners of any motor vehicle constructed and 
             operated primarily for the transportation of the driver or the driver 
             and one or more nonpaying passengers.  Such nonresident owners, 
             when duly licensed in the state of residence, are hereby granted the 
             privilege of operation of any such vehicle within this state to the 
             extent that reciprocal privileges are granted to residents of this state 
             by the state of residence of such nonresident owner.
             
             Kan. Stat. Ann.  8_138a.  Interestingly, this provision allows for the recognition 
             of registrations and titles issued by tribes residing outside of Kansas.  See State 
             v. Wakole, 959 P.2d 882, 885_86 (Kan. 1998) (noting that the state of Oklahoma 
             recognized an Oklahoma tribe's license plates as valid for use on Oklahoma 
             highways; thus, holding that a vehicle with the Oklahoma tribe's license plate 
             was "duly licensed" under Kan. Stat. Ann.  8_138a). 
              
             
     
             
             
             
             
    
                  On September 14, 1999, the tribe filed a complaint against Karla Pierce, 
    
             secretary of revenue for the state of Kansas; Sheila Walker, director of vehicles 
    
             for the state of Kansas; and Don Brownlee, superintendent for the Kansas 
    
             Highway Patrol, alleging that the state was compelled to grant recognition to 
    
             tribal motor vehicle registrations and titles pursuant to the Indian Commerce 
    
             Clause, the Kansas Act for Admission, and other federal law.  On the same day, 
    
             the tribe filed a motion for a TRO and preliminary injunction, asking that the 
    
             district court "enjoin the Defendants from enforcing the Kansas motor vehicle 
    
             registration and titling laws against the Plaintiff and any persons who operate or 
    
             own a vehicle registered and titled under [the] Tribal Code § 17_10_1 et seq." 
    
             Aplts' App. vol. I, at 89 (tribe's motion for a TRO and preliminary injunction).
    
                  After conducting a hearing, the district court granted the tribe a TRO.  In 
    
             response, the defendants asked the district court to (1) provide specific findings 
    
             of fact to justify the issuance of the TRO, (2) clarify the scope and extent of the 
    
             TRO, (3) clarify that the TRO was in effect a preliminary injunction, and (4) stay 
    
             the TRO pending appeal.  With respect to the first request, the district court 
    
             refused, stating that "the record is sufficiently clear as to the basis for the 
    
             issuance of the TRO."   Id. vol. II, at 138 (district court order, filed Oct. 13,
             
     
             
             
             
             1999).  It did, however, provide some clarification as to the scope and extent of 
    
             the TRO, and it also granted the tribe a preliminary injunction.  Finally, the 
    
             district court rejected the application for stay, noting that "[i]f the court were to 
    
             issue the requested stay, the tribal members protected by the injunction would 
    
             immediately become vulnerable to the arrests, citations[,] and related legal 
    
             matters."  Id. at 141 (district court order, filed Oct. 13, 1999).
    
                  The defendants subsequently appealed the denial of stay to this court, 
    
             arguing that "[t]he district court's order does not preserve but rather changes the 
    
             status quo because it frees the tribe to issue as many tribal tags and registrations 
    
             to whomever it wishes."  Aplts' App. for Stay at 5 (filed Oct. 15, 1999).  This 
    
             court held in favor of the defendants, granting a stay pending appeal.  It 
    
             concluded:  "[I]t is appropriate to preserve the status quo as it existed prior to the 
    
             district court's entry of the injunction pending determination of the issues on 
    
             appeal."  10th Cir. Order at 2 (filed Nov. 9, 1999).
    
             
             
    
                  Prior to oral argument, the tribe filed a motion with this court, asking that 
    
             we dismiss the appeal of the preliminary injunction as moot.  See Aple's Mot. to 
    
             Vacate Inj. & Dismiss Appeal at 3_4 (filed Dec. 30, 1999) (noting that the tribe 
    
             "reduced the number of tribally registered and titled vehicles to the point where 
    
             the Nation longer desires to pursue an injunction").  During oral argument, 
    
             however, the tribe conceded that the appeal was not moot, and we therefore 
    
             address the two major arguments raised by the defendants:  (1) that the district 
    
             court did not have jurisdiction over the instant case and (2) that the district court 
    
             abused its discretion in issuing the preliminary injunction.
    
             
    
             A.  Jurisdiction
    
                  1.  Federal Question Jurisdiction
    
                  According to the defendants, the district court lacked jurisdiction over the 
    
             instant case because the tribe did not raise a "colorable federal claim."  Aplts' Br. 
    
             at 41.  As a preliminary matter, we note that the defendants did not bring this 
    
             issue to the attention of the district court during the proceedings below.  That 
    
             failure, however, does not preclude our review because, "[s]o long as a case is 
    
             pending, the issue of federal court jurisdiction may be raised at any stage of the
             
     
             
             
             
             proceedings either by the parties or by the court on its own motion."  Ramey 
    
             Constr. Co. v. Apache Tribe of the Mescalero Reservation, 673 F.2d 315, 318 
    
             (10th Cir. 1982).
    
                  The defendants are correct in noting that a federal claim must be colorable 
    
             to establish federal question jurisdiction.  See Aldinger v. Howard, 427 U.S. 1, 7 
    
             (1976) ("[W]here federal jurisdiction is properly based on a colorable federal 
    
             claim, the court has the right to decide all the questions in the case . . . .") 
    
             (citation and internal quotation marks omitted); BIW Deceived v. Local S6, 
    
             Industrial Union of Marine & Shipbuilding Workers of America, IAMAW, 132 
    
             F.3d 824, 832 (1st Cir. 1997) ("As a matter of common practice, a district court 
    
             confronted with a question of subject matter jurisdiction reviews a plaintiff's 
    
             complaint not to judge the merits, but to determine whether the court has the 
    
             authority to proceed.  When conducting this inquiry, the court only asks whether 
    
             the complaint, on its face, asserts a colorable federal claim.").
    
                  But the defendants improperly suggest that a claim is colorable only when 
    
             it must succeed on the merits.  We are unaware of any case that defines 
    
             colorability in such strict terms; indeed, a review of case law demonstrates 
    
             otherwise.  For example, the First Circuit has defined "colorable" as "`seemingly 
    
             valid or genuine,'" BIW, 132 F.3d at 832 n.4 (quoting Webster's New Collegiate
             
     
             
             
             
             Dictionary 220 (1981)); the Eighth as "not without some merit," Jensen v. 
    
             Schweiker, 709 F.2d 1227, 1230 n.2 (8th Cir. 1983); and the Ninth as not 
    
             "wholly insubstantial, immaterial, or frivolous."  Boettcher v. Secretary of Health 
    
             & Hum. Servs., 759 F.2d 719, 722 (9th Cir. 1985).
    
                  In this circuit, "colorable" has been similarly ? and generously ? defined. 
    
             In Harline v. DEA, 148 F.3d 1199 (10th Cir. 1998), for example, we held that
    
                       [t]o determine whether a claim is colorable, it is necessary to 
                  examine its merits.  A determination that a claim lacks merit, 
                  however, does not necessarily mean it is so lacking as to fail the 
                  colorable test.  A . . . claim . . . is not colorable if it is immaterial 
                  and made solely for the purpose of obtaining jurisdiction or . . . is 
                  wholly insubstantial or frivolous.
                  
             Id. at 1203 (internal quotation marks omitted); see also United States v. McAleer, 
    
             138 F.3d 852, 857 (10th Cir. 1998) (defining "colorable" as having "some 
    
             possible validity").
    
                  Given these liberal definitions, we conclude that, in the instant case, the 
    
             tribe did raise a colorable federal claim.  The tribe alleged in its complaint that, 
    
             under federal law ? in particular, the Indian Commerce Clause and the Kansas 
    
             Act for Admission ? the state was required to extend recognition to the motor 
    
             vehicle registrations and titles issued by the tribe.  This claim was not "wholly 
    
             insubstantial or frivolous" in light of the various Supreme Court cases in which 
    
             the validity of state motor vehicle laws as applied to tribes and their members
             
     
             
             
             
             was challenged on similar grounds.  See, e.g., Oklahoma Tax Comm'n v. Sac & 
    
             Fox Nation, 508 U.S. 114, 127 (1993) (questioning the validity of a state motor 
    
             vehicle excise tax and registration fee as applied to a tribe and its members); 
    
             Washington v. Confederated Tribes of the Colville Indian Reservation, 447 U.S. 
    
             134, 162_64 (1980) (concluding that a state lacked authority to impose a motor 
    
             vehicle excise tax upon a tribe and its members when the tax was not "tailored to 
    
             the amount of actual off_reservation use"); Moe v. Confederated Salish & 
    
             Kootenai Tribes of the Flathead Reservation, 425 U.S. 463, 480_81 (1976) 
    
             (concluding that a state personal property tax on motor vehicles was invalid as to 
    
             a tribe and its members).  We also take note of cases such as Red Lake Band of 
    
             Chippewa Indians v. State, 248 N.W.2d 722 (Minn. 1976), and Queets Band of 
    
             Indians v. Washington, 765 F.2d 1399 (9th Cir. 1985), vacated as moot, 783 F.2d 
    
             154 (1986), each of which involved a tribal challenge to state motor vehicle 
    
             registration and titling laws on the basis of federal law.
    
             
    
                  2.  Article III Case or Controversy and Standing
    
                  The next issue raised by the defendants is whether the tribe's claim 
    
             presents an Article III case or controversy.  Though the defendants raised this 
    
             issue below, the district court did not address it, simply granting the TRO and
             
     
             
             
             
             preliminary injunction to the tribe without comment.  "We review de novo issues 
    
             . . . that are prerequisites to this court's jurisdiction."  Office of Thrift 
    
             Supervision v. Overland Park Fin. Corp. (In re Overland Park Financial Corp.), 
    
             236 F.3d 1246, 1253_54 (10th Cir. 2001).
    
                  Article III provides that the exercise of the "judicial Power" is restricted to 
    
             actual "cases" and "controversies."  U.S. Const. art. III, § 2.  Therefore, under 
    
             Article III, a federal court is prohibited from entertaining a case in which the 
    
             issues are not yet ripe, in which the issues are moot, or in which the parties lack 
    
             a legally cognizable interest in the outcome.  See U.S. West, Inc. v. Tristani, 182 
    
             F.3d 1202, 1208 (10th Cir. 1999) (noting that "[t]he case or controversy 
    
             requirement of Article III admonishes federal courts to avoid premature 
    
             adjudication and to abstain from entangling themselves in abstract 
    
             disagreements") (internal quotation marks omitted), cert. denied, 528 U.S. 1106 
    
             (2000); Central Wyo. Law Assoc., P.C. v. Denhardt, 60 F.3d 684, 687 (10th Cir. 
    
             1995) (noting that, under the case_or_controversy limitation of Article III, a case 
    
             must be live and not moot); AMISUB (PSL), Inc. v. State of Colo. Dep't of Soc. 
    
             Servs., 879 F.2d 789, 794 (10th Cir. 1989) (noting that, if a party "does not have 
    
             a legally cognizable interest in the outcome of the case, no live controversy exists
             
     
             
             
             
             ? any issuing federal opinion would be purely advisory, and, as such, prohibited 
    
             by Article III").
    
                  Because there are live issues before us waiting to be resolved, we hold that 
    
             the instant case is neither lacking in ripeness nor moot.  Though the tribe has 
    
             ceased issuing registrations and titles since the stay of the preliminary injunction, 
    
             it has done so on a temporary basis only; moreover, the tribal motor vehicle code 
    
             has not been repealed, and there are still four vehicles with tribal registrations 
    
             and titles in use.
    
                  As to the defendants' contention that there is no case or controversy 
    
             because the tribe lacks a legally cognizable interest, that matter is better 
    
             addressed in the context of standing, which is another issue raised by the 
    
             defendants.  See Citizens Concerned for Separation of Church & St. v. City & 
    
             Cty. of Denver, 628 F.2d 1289, 1294 (10th Cir. 1980) (noting that "the standing 
    
             doctrine has evolved as a doctrine of constitutional limitation on the federal 
    
             judicial power found in the `case or controversy' language of Article III").  As 
    
             before, the defendants argued this issue below, but the district court did not 
    
             specifically address it when granting the TRO and preliminary injunction.  We 
    
             apply de novo review.  See Overland Park, 236 F.3d at 1253_54.
    
                       Standing is an essential part of the case_or_controversy 
                  requirement and involves three elements.  First, the plaintiff must
                  
     
                  
             
             
                  have suffered an invasion of a legally_protected interest that is 
                  concrete and particularized, and actual or imminent, not conjectural 
                  or hypothetical.  Second, there must be a causal connection between 
                  the injury and the complained of conduct; that is, the injury must be 
                  fairly . . . trace[able] to the challenged action of the defendant, and 
                  not . . . th[e] result [of] the independent action of some third party 
                  not before the court.  Finally, it must be likely, not merely 
                  speculative, that the injury will be redressed by a favorable decision.
             
             Gilbert v. Shalala, 45 F.3d 1391, 1393_94 (10th Cir. 1995) (citations and 
    
             internal quotation marks omitted).
    
                  According to the defendants, the tribe does not have standing because it 
    
             has not suffered any injury through the state's refusal to grant recognition to the 
    
             tribally issued registrations and titles.  We disagree.  Motor vehicle registration 
    
             and titling is a traditional governmental function.  See Crow Tribe of Indians v. 
    
             Montana, 650 F.2d 1104, 1110 (9th Cir. 1981); Red Lake, 248 N.W.2d at 725. 
    
             The state's refusal to extend recognition, therefore, causes an obvious harm to the 
    
             tribe:  interference with or infringement on tribal self_government.  Cf. Moe, 425 
    
             U.S. at 469 n.7 (addressing tribe's contention that state motor vehicle tax could 
    
             not be imposed on tribe and its members and noting that "the Tribe, Qua Tribe, 
    
             ha[d] a discrete claim of injury with respect to these forms of state taxation so as 
    
             to confer standing upon it apart from the monetary injury asserted by the 
    
             individual [tribal members]").  Protection of that right is the foundation of federal 
    
             Indian law; accordingly, we conclude that the tribe has standing.
    
    
     
             
             
             
             
    
                  3.  Younger Abstention
    
                  In addition to these jurisdictional arguments, the defendants argue that the 
    
             district court should have abstained under Younger v. Harris, 401 U.S. 37 (1971). 
    
             During the proceedings below, the district court found that "the parties agreed 
    
             that Younger abstention was not applicable," Aplts' Br. at 45, and therefore did 
    
             not address it.  On appeal, the defendants contend that they never conceded the 
    
             point and, from the record, it appears that this is true.  See Aplts' App. vol. III, at 
    
             103 (counsel for tribe, not defendants, arguing at clarification hearing that the 
    
             Younger abstention issue was moot).  We review the issue de novo.  See J.B. ex 
    
             rel. Hart v. Valdez, 186 F.3d 1280, 1291 (10th Cir. 1999).
    
                  Younger abstention is predicated on the "desire to permit state courts to try 
    
             state cases free from interference by federal courts."  Younger, 401 U.S. at 43. 
    
             Under Younger, it is appropriate for a federal court to abstain from hearing a case 
    
             if (1) a state judicial proceeding is ongoing; (2) an important state interest is at 
    
             stake; and (3) there is an adequate opportunity in the state proceeding to raise 
    
             federal claims.  See Seneca_Cayuga Tribe of Okla. v. Oklahoma, 874 F.2d 709, 
    
             711 (10th Cir. 1989). 
    
    
     
             
             
             
                  The defendants suggest that we should abstain in the instant case because 
    
             future prosecutions based on a failure to comply with the state motor vehicle 
    
             registration and titling laws are possible.  The possibility of future prosecutions, 
    
             however ? even the likelihood of future prosecutions ? is not sufficient to justify 
    
             Younger abstention.  As noted above, before Younger abstention may be invoked, 
    
             "there must be an ongoing state . . . proceeding[]," Taylor v. Jaquez, 126 F.3d 
    
             1294, 1297 (10th Cir. 1997) (emphasis added).  Because the defendants have not 
    
             pointed to any such state proceeding (all citations issued to the tribe or its 
    
             members having been resolved), Younger abstention is patently inapplicable.
    
             
    
                  B.  Preliminary Injunction
    
                  Having addressed the defendants' jurisdictional arguments, we now 
    
             proceed to the defendants' challenge to the preliminary injunction entered by the 
    
             district court.  As noted above, the district court enjoined the defendants from 
    
             "any further application or enforcement of the Kansas motor vehicle registration 
    
             or titling laws against the [tribe] and any persons who operate or own a vehicle 
    
             registered and titled under [the] Tribal Code . . . ."  Aplts' App. vol. II, at 143 
    
             (district court order, filed Oct. 13, 1999).
    
                  The defendants contend that the district court erred in granting this
             
     
             
             
             
             injunctive relief on several grounds.  First, they assert that the preliminary 
    
             injunction was not sufficiently specific as required by Federal Rule of Civil 
    
             Procedure 65(d).  Second, they argue that as a matter of law the district court 
    
             applied the wrong standard in deciding to issue the preliminary injunction. 
    
             Finally, they contend that, even if the district court applied the proper standard, 
    
             the tribe failed to demonstrate that a preliminary injunction was necessary.  We 
    
             review de novo the issue of specificity under Rule 65(d).  See Reliance Ins. Co. 
    
             v. Mast Constr. Co., 159 F.3d 1311, 1316 (10th Cir. 1998).  We review for an 
    
             abuse of discretion the grant of a preliminary injunction.  See ACLU v. Johnson, 
    
             194 F.3d 1149, 1155 (10th Cir. 1999).  A district court abuses its discretion if it 
    
             "commits an error of law, or is clearly erroneous in its preliminary factual 
    
             findings."  Id. (internal quotation marks omitted).
    
             
    
                  1.  Specificity:  Federal Rules of Civil Procedure 65(d) and 52(a)
    
                  On appeal, the defendants first argue that the preliminary injunction 
    
             granted by the district court was not sufficiently specific as required by Federal 
    
             Rule of Civil Procedure 65(d).  According to the state, it was not clear from the 
    
             district court order "precisely what acts [were being] forbidden."  Aplts' Br. at 
    
             33. 
    
    
                  [e]very order granting an injunction . . . shall set forth the reasons 
                  for its issuance; shall be specific in terms; shall describe in 
                  reasonable detail, and not by reference to the complaint or other 
                  document, the act or acts to be restrained; and is binding only upon 
                  the parties to the action, their officers, agents, servants, employees, 
                  and attorneys, and upon those persons in active concert or 
                  participation with them who receive actual notice of the order by 
                  personal service or otherwise.
             
             Fed. R. Civ. P. 65(d).  "[T]he specificity provisions of Rule 65(d) are no 
    
             mere technical requirements.  The Rule was designed to prevent 
    
             uncertainty and confusion on the part of those faced with injunctive orders, 
    
             and to avoid the possible founding of a contempt citation on a decree too 
    
             vague to be understood."  Schmidt v. Lessard, 414 U.S. 473, 476 (1974) 
    
             (per curiam); see also Keyes v. School Dist. No. 1, Denver, Colo., 895 
    
             F.2d 659, 668 (10th Cir. 1990) (noting that "an injunction [must] be 
    
             reasonably specific in identifying what acts are prohibited or required, both 
    
             to give notice to the defendant of what is prohibited, and to guide an 
    
             appellate court in reviewing the defendant's compliance or noncompliance 
    
             with the injunction").
    
                  However, Rule 65(d) does not require the impossible.  See Reliance, 159 
    
             F.3d at 1316_17 ("`There is a limit to what words can convey. . . . The right to 
    
             seek clarification or modification of the injunction provides assurance, if any be
             
     
             
             
             
             sought, that proposed conduct is not proscribed.'") (quoting Scandia Down Corp. 
    
             v. Euroquilt, Inc., 772 F.2d 1423, 1431_32 (7th Cir. 1985)); see also Johnson v. 
    
             Radford, 449 F.2d 115, 117 (5th Cir. 1971) ("A temporary injunction is intended 
    
             to be temporary, to meet the exigencies of the situation, and necessarily at times 
    
             lacks the degree of precision which may be required on final decree.").  A 
    
             preliminary injunction is vague only when "the delineation of the proscribed 
    
             activity lacks particularity or when containing only an abstract conclusion of law, 
    
             not an operative command capable of enforcement."  CF&I Steel Corp. v. United 
    
             Mine Workers of America, 507 F.2d 170, 173 (10th Cir. 1974) (internal quotation 
    
             marks omitted).
    
                  Here, the preliminary injunction provided that the state was barred from 
    
             "any further application and enforcement of the Kansas motor vehicle registration 
    
             or titling laws against the [tribe] and any persons who operate or own a vehicle 
    
             registered and titled under [the tribal motor vehicle code].  This order applies to 
    
             vehicles driven both on and off of the [tribe's] reservation."  Aplts' App. vol. II, 
    
             at 143 (district court order, filed Oct. 13, 1999).  The order also stated that 
    
             "[t]his injunction is not meant to have any effect on cases which are currently 
    
             pending before any Kansas state court and is not meant to have any effect on 
    
             Kansas traffic laws that do not deal directly with vehicle registration, vehicle
             
     
             
             
             
             license plates[,] and motor vehicle titles."  Id.
    
                  We are at a loss as to how this order was inadequate under Rule 65(d).  At 
    
             issue in this case is whether the state must grant recognition to motor vehicle 
    
             registrations and titles issued by the tribe.  The preliminary injunction addressed 
    
             this issue head on and stated precisely what conduct was being enjoined: 
    
             Vehicles registered and titled by the tribe could not be cited for noncompliance 
    
             with state registration and titling laws.  Notably, the defendants in their brief fail 
    
             to explain how the preliminary injunction was lacking, simply stating in 
    
             conclusory terms that "the order of injunctive relief fails to meet the specificity 
    
             standards [of Rule 65]."  Aplts' Br. at 32. 
    
                  During the proceedings below, the defendants did argue that the TRO was 
    
             not sufficiently specific because it was "unclear or perhaps subject to 
    
             interpretation what the term[s] applying and enforcing [as used in the TRO] 
    
             mean[t]."  Aplts' App. vol. III, at 28.  The defendants also argued that it was 
    
             "unclear" as to whether "the [TRO] only applie[d] to [Kan. Stat. Ann. §] 8_142, 
    
             which is the issuance of traffic tickets," or was broader in "scope and extent." 
    
             Id. at 76_77.  To the extent that these are the defendants' grounds for challenging 
    
             the preliminary injunction, we hold that they are meritless.  There was nothing 
    
             vague about the use of the words "apply" and "enforce" in the district court's
             
     
             
             
             
             order; indeed, it is the norm to speak of the application and enforcement of laws. 
    
             Nor was the scope and extent of the preliminary injunction unclear simply 
    
             because the order did not list the exact state laws that could not be applied to the 
    
             tribe and its members.  It is sufficient that the preliminary injunction provided 
    
             that "[t]his injunction is not meant to have any effect . . . on Kansas traffic laws 
    
             that do not deal directly with vehicle registration, vehicle license plates[,] and 
    
             motor vehicle titles."  Aplts' App. vol. II, at 143 (district court order, filed Oct. 
    
             13, 1999) (emphasis added); cf. Reliance, 159 F.3d at 1316 ("Rule 65(d) requires 
    
             only that the enjoined conduct be described in reasonable, not excessive, detail ?
    
             particularly in cases like this when overly precise terms would permit the very 
    
             conduct sought to be enjoined.").
    
                  Though the preliminary injunction is in accord with Rule 65(d), there is 
    
             some question as to whether it complies with Federal Rule of Civil Procedure 
    
             52(a).  Under Rule 52(a), a district court is required to make findings of fact and 
    
             conclusions of law at the time it enters a preliminary injunction.  See Fed. R. 
    
             Civ. P. 52(a); Mesa Petroleum Co. v. Cities Serv. Co., 715 F.2d 1425, 1433 (10th 
    
             Cir. 1983).  Our concern here is with the adequacy of the findings and 
    
             conclusions made by the district court.
    
                  As a preliminary matter, we note that the defendants do not explicitly raise
             
     
             
             
             
             this argument on appeal.  However, we are compelled to address the issue 
    
             because, without adequate findings of fact and conclusions of law, appellate 
    
             review is in general not possible.  See Knapp Shoes, Inc. v. Sylvania Shoe Mfg. 
    
             Corp., 15 F.3d 1222, 1227 (1st Cir. 1994) (noting that Rule 52(a) requires a trial 
    
             court to "set forth the findings of fact and conclusions of law which constitute 
    
             the grounds of its action" and that the rule "reflects the importance of injunctions 
    
             and of providing an adequate basis for their appellate review") (internal quotation 
    
             marks omitted); Curtis v. Commissioner, 623 F.2d 1047, 1051 (10th Cir. 1980) 
    
             (noting that a trial court's findings of fact "may be challenged as inadequate to 
    
             give a clear understanding of the process by which the court's ultimate 
    
             conclusions were reached and thus inadequate to permit appellate review").
    
                  In the instant case, the district court made no explicit factual findings or 
    
             legal conclusions when it issued the preliminary injunction.  See Aplts' App. vol. 
    
             II, at 143 (district court order, filed Oct. 13, 1999) (simply granting the 
    
             preliminary injunction and stating its parameters).  It did, however, give findings 
    
             of fact and conclusions of law when it granted the TRO.  For purposes of this 
    
             opinion, we assume that it is proper for us to look to the findings and conclusions 
    
             in the TRO because the parties agreed that the TRO was in effect a preliminary 
    
             injunction.  See id. vol. II, at 93 (defendants' request for clarification, filed Sept.
             
     
             
             
             
             27, 1999) (noting that the TRO was in effect a preliminary injunction); id. vol. 
    
             III, at 89 (counsel for tribe at clarification hearing) ("So the way I see this 
    
             hearing [for clarification] today is . . . we are ready to have the Court determine 
    
             that a preliminary injunction should be issued.").
    
                  In granting the TRO, the district court made the following findings of fact 
    
             and conclusions of law:
    
                  The court finds that if the defendants are not enjoined from 
                  enforcing the Kansas motor vehicle registration and titling laws 
                  pending the outcome of this case, the plaintiff would suffer 
                  irreparable injury.  The court has considered the parties' arguments 
                  concerning the balancing of potential injury to the parties and finds 
                  that the potential harm to the plaintiff if the temporary restraining 
                  order is not issued outweighs any potential harm to the defendants 
                  which would be caused by the issuance of the order.  The court 
                  further finds that the issuance of this temporary restraining order 
                  would not be contrary to the public interest.
                  
                       If the plaintiff satisfies the first three elements, the standard 
                  for meeting the fourth requirement, likelihood of prevailing on the 
                  merits, becomes more lenient.  In such a case, the plaintiff need only 
                  show that the issues are so serious, substantial, difficult, and 
                  doubtful as to make them fair ground for litigation.  Given this 
                  standard, the court finds that the plaintiff has met its burden of 
                  showing a likelihood of prevailing on the merits.
                  
             Id. vol. II, at 85_86 (district court order, filed Sept. 23, 1999) (citation omitted).
    
                  Though we accord great deference to the district court, we believe that 
    
             these findings do not give a clear understanding of the process by which its 
    
             ultimate conclusions were reached.  Although Rule 52(a) does not require "over_
    
             elaboration of detail or particularization of facts," conclusory findings are not 
    
             sufficient compliance with the Federal Rules of Civil Procedure.  Knapp, 15 F.3d 
    
             at 1228 (internal quotation marks omitted); see also EEOC v. United Virginia 
    
             Bank/Seaboard Nat., 555 F.2d 403, 406 (4th Cir. 1977) ("When the trial court 
    
             provides only conclusory findings, illuminated by no subsidiary findings or 
    
             reasoning on all the relevant facts, . . . there is not that `detail and exactness' on 
    
             the material issues of fact necessary for an understanding by an appellate court of 
    
             the factual basis for the trial court's findings and conclusions . . . .").  
    
                  There are times, however, when a district court's failure to comply with 
    
             Rule 52(a) will not necessitate a remand for clarification.  For example, it has 
    
             been held that a court of appeals can consider a district court's failure to make 
    
             adequate findings of fact as nonreversible error if it can ascertain from the record 
    
    
     
             
             
             
             that one party or the other was clearly entitled to judgment in its favor.  See 
    
             Kweskin v. Finkelstein, 223 F.2d 677, 679 (7th Cir. 1955); see also United States 
    
             ex rel. Citizen Band Potawatomi Indian Tribe of Okla. v. Enterprise Mgmt. 
    
             Consultants, Inc., 883 F.2d 886, 889 (10th Cir. 1989) (noting the same).  It has 
    
             also been held that, if "[t]here is . . . no danger of confusion about what is 
    
             required by the order or the basis of the decision [and] the record on appeal 
    
             supports the court's order and indicates the court heard evidence on each element[,] . . . any lack of specific findings of fact is harmless error."  Anthony 
    
             v. Texaco, Inc., 803 F.2d 593, 600 (10th Cir. 1986) (citations omitted). 
    
             Accordingly, we conclude that, in the instant case, a remand for clarification is 
    
             not necessary:  It was clear from the preliminary injunction what activity was 
    
             being proscribed, and the record on appeal indicates not only that the district 
    
             court heard evidence on the matter but also that the evidence supported issuance 
    
             of the preliminary injunction.
    
             
    
                  2.  Preliminary Injunction Standard
    
                  The defendants argue next that the district court applied the wrong standard 
    
             in deciding to grant the tribe the preliminary injunction.  See SCFC ILC, Inc. v. 
    
             Visa USA, Inc., 936 F.2d 1096, 1098 (10th Cir. 1991) (noting that this court 
    
             "will set aside a preliminary injunction if the district court applied the wrong 
    
             standard when deciding to grant the preliminary injunction motion").  Ordinarily, 
    
             a party seeking a preliminary injunction must satisfy a four_factor test in order to 
    
             be awarded such temporary relief.  The requesting party must demonstrate (1) 
    
             that it has a substantial likelihood of prevailing on the merits; (2) that it will 
    
             suffer irreparable harm unless the preliminary injunction is issued; (3) that the 
    
             threatened injury outweighs the harm the preliminary injunction might cause the
             
     
             
             
             
             opposing party; and (4) that the preliminary injunction if issued will not 
    
             adversely affect the public interest.  See Federal Lands Legal Consortium v. 
    
             United States, 195 F.3d 1190, 1194 (10th Cir. 1999) [hereinafter FLLC].  "As a 
    
             preliminary injunction is an extraordinary remedy, the [requesting party's] right 
    
             to relief must be clear and unequivocal."  Visa, 936 F.2d 1098 (citation omitted).
    
                  That being said, there is one slight wrinkle to this four_factor test.  If the 
    
             party seeking the preliminary injunction can establish the last three factors listed 
    
             above, then the first factor becomes less strict ? i.e., instead of showing a 
    
             substantial likelihood of success, the party need only prove that there are 
    
             "questions going to the merits . . . so serious, substantial, difficult, and doubtful 
    
             as to make the issue ripe for litigation and deserving of more deliberate 
    
             investigation."  FLLC, 195 F.3d at 1194.
    
                  In the instant case, the district court applied this "traditional" standard, 
    
             finding that the tribe had satisfied the last three factors and that it had also met 
    
             the first factor under the more lenient formulation.  It therefore granted the tribe 
    
             the preliminary injunction, enjoining the defendants from enforcing the state 
    
             registration and titling laws with respect to the tribe and its members.  On appeal, 
    
             the defendants argue that the traditional standard should not have been used 
    
             because the preliminary injunction issued by the district court (1) afforded the
             
     
             
             
             
             tribe substantially all the relief it might recover after a full trial on the merits and 
    
             (2) disturbed the status quo.  According to the defendants, these types of 
    
             preliminary injunctions are disfavored, and, before a disfavored preliminary 
    
             injunction may be granted, the requesting party must satisfy a "heightened" 
    
             standard ? i.e., demonstrate that the four factors listed above weigh "heavily and 
    
             compellingly" in its favor.(4)  See Kikumura v. Hurley, No. 99_1284, 2001 WL 
    
             237373, at *3 (10th Cir. Mar. 9, 2001) (internal quotation marks omitted). 
    
             
    
                       a.  Granting Substantially All the Relief Sought
    
                  As a preliminary matter, we note that the defendants never argued before 
    
             the district court that a heightened standard should apply on the ground that the 
    
             preliminary injunction desired by the tribe would afford it substantially all the 
    
             relief it might recover.  In light of this fact, we consider the argument waived.  See Vitkus v. Beatrice Co., 127 F.3d 936, 946 (10th Cir. 1997) ("As a general 
    
             rule, a federal court of appeals will not consider an issue not passed upon 
    
             below.").
    
                  Even if the argument had been properly presented, we would not rule in the 
    
             defendants' favor.  "[T]he terms `all the relief to which the movant would be 
    
             entitled' or `all the relief sought' have . . . been the source of confusion because, 
    
             read literally, they appear to describe any injunction where the final relief for the 
    
             plaintiff would simply be a continuation of the preliminary relief."  Tom Doherty 
    
             Assoc., Inc. v. Saban Entm't, Inc., 60 F.3d 27, 34 (2d Cir. 1995).  There is no 
    
             reason, however, to disfavor a preliminary injunction simply because "the 
    
             plaintiff would get no additional relief if he prevailed at the trial on the merits." 
    
             Id. (internal quotation marks omitted).  The only reason to disfavor a preliminary 
    
             injunction that grants substantially all the relief sought is if it would "render a 
    
             trial on the merits largely or completely meaningless."  Id. at 35.  Therefore, "`all 
    
             the relief to which a plaintiff may be entitled' must be supplemented by a further 
    
             requirement that the effect of the order, once complied with, cannot be undone." 
    
             Id.; see also id. (giving examples of preliminary relief that cannot be undone ?
    
             for instance, "a case involving the live televising of an event scheduled for the
             (4)       In this circuit, there are three types of preliminary injunctions that are 
             disfavored: (1) those that afford the moving party substantially all the relief it 
             might recover after a full trial on the merits, (2) those that disturb the status quo, 
             and (3) those that are mandatory as opposed to prohibitory.  See Visa, 936 F.2d 
             at 1098_99.  In the instant case, the defendants do not sufficiently argue that the 
             preliminary injunction was mandatory in nature.  See King v. Town of Hanover, 
             116 F.3d 965, 970 (1st Cir. 1997) ("It is an established appellate rule that issues 
             adverted to in a perfunctory manner, unaccompanied by some effort at developed 
             argumentation, are deemed waived. . . . It is not enough merely to mention a 
             possible argument in the most skeletal way, leaving the court to do counsel's 
             work.") (internal quotation marks omitted).
             
     
             
             
             
             day on which preliminary relief is granted" or "a case involving the disclosure of 
    
             confidential information").
    
                  In the instant case, the relief ultimately sought by the tribe was state 
    
             recognition of its registrations and titles.  The preliminary injunction issued by 
    
             the district court gave the tribe at most only temporary recognition, not 
    
             permanent.  In other words, if the tribe was not successful at trial, then the 
    
             defendants would be permitted to cite any vehicle with a tribal registration and 
    
             title.  Therefore, the preliminary injunction granted by the district court did not, 
    
             as the defendants contend, afford the tribe substantially all the relief it might 
    
             recover.  This interim relief, quite simply, was not "complete."  Eng v. Smith, 
    
             849 F.2d 80, 82 (2d Cir. 1988).
    
             
    
                       b.  Altering the Status Quo
    
                  During the proceedings below, the defendants suggested to the district 
    
             court that a heightened standard, and not the traditional one, should apply 
    
             because the injunctive relief sought by the tribe would change the status quo. 
    
             More specifically, Mr. Brownlee asserted, in his response to the tribe's motion 
    
             for a TRO, that "[c]ourts have applied certain additional standards in judging a 
    
             request for injunctive relief which should be considered with regard to the tribe's
             
     
             
             
             
             present motion for TRO . . . . [For example,] an injunction will not issue which 
    
             has the effect of disturbing the status quo."  Aplts' App. vol. II, at 46 (Mr. 
    
             Brownlee's response to tribe's motion for a TRO, filed Sept. 25, 1999).  Nothing 
    
             more was said on the status quo issue, though, until the clarification hearing on 
    
             October 7, 1999, in which the district court responded to the defendants' 
    
             "objections" to the issuance of the TRO.  
    
                  During that hearing, the defendants for the first time articulated with any 
    
             substance their status quo argument:
    
                  On September 23[d], the Court took like a snapshot of the situation 
                  and said, `The balance of harms appears to be in favor of granting 
                  the TRO for the Plaintiff.'  But what the Plaintiff has done with that 
                  TRO since is taken advantage of the situation by issuing many more 
                  tribal registrations . . . . [T]here were 20 at that the time that we 
                  stood in front of you a week ago [when the TRO was issued].  And 
                  we feared that ? you know, 20 vehicles is a status quo.
                  
                       But since then, they have apparently taken advantage of the 
                  situation.  They have between 400 and 500 members that they could 
                  be issuing these registrations to. . . . [T]he problem is that the state 
                  is restrained while the other party is not.  And the other party is free 
                  to use the Court's order as a sword, not as a shield and to take action 
                  to change the status quo.
                  
             Aplts' App. vol. III, at 79_80 (counsel for Mr. Brownlee at clarification hearing). 
    
             The district court did not respond to the argument and simply converted the TRO 
    
             it had issued to a preliminary injunction.  
    
    
     
             
             
             
                  Subsequently, the defendants presented the same argument before the 
    
             district court when they sought a stay of the preliminary injunction pending 
    
             appeal.  Once again, the district court did not address the argument and simply 
    
             denied the application for stay.  This led the defendants to file an application for 
    
             stay before this court, which was ultimately granted on November 9, 1999. 
    
             Notably, the defendants' argument before this court was, yet again, that the 
    
             preliminary injunction altered the status quo because, while it prevented the state 
    
             from issuing more citations, "it free[d] the tribe to issue as many tribal tags and 
    
             registrations to whomever it wishe[d]."  Aplts' App. for Stay at 5 (filed Oct. 18, 
    
             1999).
    
                  From this review of the proceedings, it is clear that the defendants did 
    
             preserve for our consideration the general issue of status quo.  But it should be 
    
             noted that, on appeal, the defendants present a markedly different status quo 
    
             argument, one never raised before the district court ? i.e., that the preliminary 
    
             injunction disturbed the status quo because, prior to the lawsuit, the "last 
    
             uncontested status" between the parties was when the tribe had no motor vehicle 
    
             code of its own and willingly complied with the state registration and titling 
    
             laws.  See Visa, 936 F.2d at 1100 n.8 (defining status quo as "the last
             
     
             
             
             
             uncontested status between the parties which preceded the controversy until the 
    
             outcome of the final hearing") (internal quotation marks omitted).  
    
                  We do not approve of this sudden change of tune by the defendants. 
    
             Consequently, we do not consider on appeal the defendants' new status quo 
    
             argument.  See Fed. R. Civ. P. 46 (requiring that "a party, at the time the ruling 
    
             or order of the court is made or sought, make[] known to the [trial] court the 
    
             action which the party desires the court to take or the party's objection to the 
    
             action of the court and the grounds therefor") (emphasis added); Shultz v. Rice, 
    
             809 F.2d 643, 647 (10th Cir. 1986) (noting that a trial court should be 
    
             "provide[d] . . . with the opportunity to know the specific contentions and to take 
    
             corrective action, if required"); see also Singleton v. Wulff, 428 U.S. 106, 121 
    
             (1976) ("The matter of what questions may be taken up and resolved for the first 
    
             time on appeal is one left primarily to the discretion of the courts of appeals."). 
    
             We limit our review instead to the argument that the defendants made below, that 
    
             is, that the preliminary injunction changed the status quo because, although it 
    
             restrained the state from issuing more citations, it did not restrict the tribe from 
    
             issuing more registrations and titles.
    
                  To begin our analysis, we agree with the defendants that the preliminary 
    
             injunction did not name the tribe as a restricted party.  It simply specified that the
             
     
             
             
             
             defendants were restrained from acting ? i.e., from "any further application and 
    
             enforcement of the Kansas motor vehicle registration or titling laws against the 
    
             [tribe] and any persons who operate or own a vehicle registered and titled under 
    
             [the] Tribal Code . . . ."  Aplts' App. vol. II, at 143 (district court order, filed 
    
             Oct. 13, 1999).  It seems to us, then, that under the terms of the preliminary 
    
             injunction the tribe was in fact free to increase its registration and titling if it so 
    
             desired.  But while the preliminary injunction permitted the tribe to proceed with 
    
             more registration and titling, it did not as a necessary consequence protect all 
    
             registration and titling.  According to the preliminary injunction, only vehicles 
    
             "registered and titled" under the tribal motor vehicle code were protected.  The 
    
             use of the past tense here is significant.  It indicates that the preliminary 
    
             injunction applied only to those tribal registrations and titles already existing as 
    
             of the time the preliminary injunction was entered.  Had the preliminary 
    
             injunction been intended to include future tribal registrations and titles, it would 
    
             have read differently.  For example:  "The defendants are enjoined from applying 
    
             and enforcing the state registration and titling laws with respect to vehicles
             
     
             
             
             
             registered and titled, or to be registered and titled, under the tribal motor vehicle 
    
             code."(5)
    
                  Because the preliminary injunction extends only to those tribal 
    
             registrations and titles already existing prior to its issuance, we reject the 
    
             defendants' argument that the preliminary injunction disturbed the status quo. 
    
             Status quo means literally "[t]he situation that currently exists," Black's Law 
    
             Dictionary 1420 (7th ed. 1999), and at the time the tribe filed suit the situation 
    
             currently existing was one in which (1) the state motor vehicle code was in force, 
    
             (2) the tribal motor vehicle code was in force, and (3) approximately twenty 
    
             tribal registrations and titles were in use.  The preliminary injunction issued by 
    
             the district court in essence "froze" that moment in time, giving (temporary) 
    
             validity to the tribal registrations and titles already issued but no more.  As the 
    
             defendants themselves recognized, "[T]he Court took like a snapshot of the 
    
             situation."  Aplts' App. vol. III, at 79 (counsel for Mr. Brownlee at clarification 
    
             hearing); see also Massachusetts Mut. Life Ins. v. Associated Dry Goods Corp., 
    
             786 F. Supp. 1403, 1427 (N.D. Ind. 1992) (recognizing that the status quo could
             
    
    
             (5)
                  Our narrow reading of the preliminary injunction is justified not only 
             because of the language used but also because of this court's authority to modify 
             overbroad injunctions.  See United States v. Jenks, 22 F.3d 1513, 1519 (10th Cir. 
             1994).   
             
     
             
             
             
             but "need not consist of a photographic replication of the circumstances existing 
    
             at the moment suit was filed").  Because the preliminary injunction issued by the 
    
             district court did not change the status quo, the district court properly applied the 
    
             traditional standard rather than the heightened one. 
    
             
    
                  3.  Preliminary Injunction Merits
    
                  Having established that the district court properly used the traditional 
    
             standard in deciding whether to issue the preliminary injunction, we now proceed 
    
             to the defendants' merit_based challenge to the injunctive relief.  We review for 
    
             an abuse of discretion.  See ACLU, 194 F.3d at 1155.  Under this deferential 
    
             standard of review, we conclude that the district court did not abuse its discretion 
    
             in analyzing the following four factors:  (1) irreparable harm, (2) balancing of 
    
             potential harms, (3) public interest, and (4) substantial likelihood on the merits.  
    
             
    
                            a.  Irreparable Harm
    
                  The concept of irreparable harm, unfortunately, "does not readily lend 
    
             itself to definition."  Wisconsin Gas Co. v. Federal Energy Regulatory Comm'n, 
    
             758 F.2d 669, 674 (D.C. Cir. 1985).  Case law has provided some guidance, 
    
             however, noting for example that the injury "must be both certain and great," id.;
             
     
             
             
             
             and that it must not be "merely serious or substantial."  A.O. Smith Corp. v. FTC, 
    
             530 F.2d 515, 525 (3d Cir. 1976).  Cases have also noted that irreparable harm is 
    
             often suffered when "the injury can[not] be adequately atoned for in money," id.; 
    
             or when "the district court cannot remedy [the injury] following a final 
    
             determination on the merits."  American Hosp. Ass'n v. Harris, 625 F.2d 1328, 
    
             1331 (3d Cir. 1980).
    
                  Given these definitions, we hold that the district court did not abuse its 
    
             discretion in determining that, without the preliminary injunction, the tribe would 
    
             suffer irreparable harm.  First, the injury to the tribe was "certain and great" and 
    
             more than "merely serious or substantial."  As noted above, motor vehicle 
    
             registration and titling is a traditional governmental function.  The tribe instituted 
    
             its motor vehicle code not out of whim but because of a need to "control[] the 
    
             access and presence of persons to and on [the] Reservation territory," a result of 
    
             "an increasing number of motor vehicles . . . being used by Indian and non_Indian 
    
             persons to enter the Reservation territory in order to engage in gaming and other 
    
             activities with Tribal enterprises or members."  PBMVC § 17_1.  Thus, the threat 
    
             of continued citation by the state created the "prospect of significant interference 
    
             with [tribal] self_government."  Seneca_Cayuga, 874 F.2d at 716 (finding
             
     
             
             
             
             irreparable injury where threatened loss of revenues and jobs created "prospect of 
    
             significant interference with [tribal] self_government").
    
                  Second, the injury to the tribe was irreparable because it could not be 
    
             adequately compensated for in the form of monetary damages.  Not only is harm 
    
             to tribal self_government not easily subject to valuation but also, and perhaps 
    
             more important, monetary relief might not be available to the tribe because of the 
    
             state's sovereign immunity.  See Kansas Health Care Ass'n, Inc. v. Kansas Dep't 
    
             of Soc. & Rehab. Servs., 31 F.3d 1536, 1543 (10th Cir. 1994) (noting that 
    
             "plaintiffs had established harm ? a legally cognizable injury to them resulting 
    
             from noncompliance with the Boren Amendment" and that the "plaintiffs' injury 
    
             was irreparable" because "the Eleventh Amendment bars a legal remedy in 
    
             damages").(6)
    
              
    
                       b.  Balancing of Potential Harms
    
                  According to the defendants, the district court failed to give adequate 
    
             consideration to the harm the state would suffer upon issuance of the preliminary 
    
             injunction.  As framed by the defendants, the injury to the state was largely one 
    
             of safety:  Vehicles with tribally issued registrations and titles do not appear in 
    
             the national crime database, and so a law enforcement officer who stops such a 
    
             vehicle has "no idea if that car is stolen [or] if there are any warrants out on the 
    
             driver," Aplts' App. vol. III, at 27 (counsel for Ms. Pierce and Ms. Walker); 
    
             consequently, the lives of law enforcement officers as well as the lives of "the 
    
             public at large" are placed in danger.  Id. at 86 (counsel for Mr. Brownlee).
    
                  While the defendants raise a legitimate concern, we cannot say that the 
    
             district court abused its discretion in determining that the injury to the tribe was
             (6)       The defendants seem to suggest that the tribe would not suffer 
             irreparable injury without the preliminary injunction because multiple compliance 
             _ i.e., compliance with both the tribal and the state registration and titling laws _
             is possible.  See Aplts' App. vol. III, at 74_75 (counsel for Ms. Pierce and Ms. 
             Walker) ("There is nothing wrong with Kansas plates and Kansas titles on the 
             back of a vehicle, and if they want to put an Indian plate on the front of the 
             vehicle, they're free to do so.").  We disagree.
             
                  It is not clear, for example, that a vehicle owner can have in her possession 
             two certificates of title, one issued by the tribe and a second issued by the state. 
             See PBMVC  17_10_19(A)(8) ("Each applicant for a [tribally issued] certificate 
             of title shall surrender to the Registrar . . . any and all other certificate of titleissued by any other governmental agency of any state which is held by the 
             applicant . . . as a prerequisite to receiving a certificate of title from the Prairie 
             Band of Potawatomi . . . .").  Without a certificate of title for each sovereign, the 
             owner could not have her vehicle registered with each sovereign.  See PBMVC  
             17_10_4(D) (noting that a certificate of title "is a prerequisite to registration of 
             [a] vehicle"); Kan. Stat. Ann.  8_135(c) (noting that "[n]o vehicle required to be 
             registered shall be registered . . . unless the applicant for registration shall 
             present satisfactory evidence of ownership and apply for an original certificate of 
             title for such vehicle").
             
     
             
             
             
             the more substantial.  We note first that, given the record, it does not seem an 
    
             impossible task for the tribe to have its relatively small number of registrations 
    
             and titles become a part of the national database.  The defendants vehemently 
    
             protest that "the Department of Revenue will not act as the Tribe's data entry 
    
             clerks for inputting data into our system," Aplts' App. vol. III, at 106 (counsel 
    
             for Ms. Pierce and Mr. Walker at clarification hearing), but there is no indication 
    
             in the record that the tribe was prevented from having its own data entry clerk or 
    
             possibly even its own system to be linked to the national database.
    
                  In addition, the record indicates that the defendants might have exaggerated 
    
             the safety problem.  In that respect, we take note of the following:  (1) Master 
    
             Trooper Gary Thiessen of the Kansas Highway Patrol stated outright in an 
    
             incident report that "this issue was not one of safety, but one of revenue," Aplts' 
    
             App. vol. III, at 118 (Kansas Highway Patrol Combined Incident Report, dated 
    
             Aug. 12, 1999); (2) vehicles with tribal registrations and titles were in use for 
    
             several months without any safety_related incident; (3) Jackson County Attorney 
    
             Micheal A. Ireland did not seem troubled by the safety issue, voluntarily adopting 
    
             a policy under which no citations would be issued to the tribe or its members 
    
             until a meeting could be held, see id., at 110 (affidavit of Mr. Ireland); (4) the 
    
             safety issue did not appear to worry the state of Minnesota, which granted
             
     
             
             
             
             recognition to the tribe's registrations and titles; and (5) in spite of its concern 
    
             about safety, Kansas still recognizes the registrations and titles of tribes residing 
    
             outside the state.  See note 2, supra.  
    
                  The defendants argue, however, that aside from the safety problem there is 
    
             another injury to which the district court did not give adequate consideration: 
    
             interference with state sovereignty.  See Aplts' Br. at 26 ("Kansas has a 
    
             significant and special sovereign interest in regulating and administering its laws 
    
             on behalf of all of its citizens on the public roads and highways that cross over 
    
             its territory.").  This argument does give us some concern; yet again we cannot 
    
             say that the district court abused its discretion in finding that, in this limited area, 
    
             the threatened injury to tribal sovereignty outweighed the potential harm to state 
    
             sovereignty.  Federal Indian law is replete with examples in which state law has 
    
             had to accommodate tribal sovereignty, whether because of federal preemption or 
    
             because of the guardian_ward relationship between the federal government and 
    
             Indian tribes.  See Felix S. Cohen, Handbook of Federal Indian Law 234 (1982 
    
             ed.) ("[Chief Justice] Marshall said [in Worcester v. Georgia, 31 U.S. 515 
    
             (1832)] that the United States had assumed the role of `protector' of the Indian 
    
             tribes, acknowledging and guaranteeing their security as distinct political 
    
             communities in exchange for their friendliness to the United States.").
             
     
             
             
             
             Furthermore, the state has not been prevented from enforcing its registration and 
    
             titling laws wholesale ? only with respect to the tribe and its members.  In 
    
             contrast, without the preliminary injunction, the tribe's registration and titling 
    
             would likely have come to an end. 
    
                  
    
                       c.  Public Interest
    
                  The defendants argue next that the preliminary injunction was adverse to 
    
             the public interest, largely because of the safety concern discussed above.  In 
    
             response, the tribe asserts that the public has an interest in encouraging tribal 
    
             self_government and that the tribal motor vehicle laws benefitted the public by 
    
             "provid[ing] a safe and efficient transportation system [and by] establish[ing] 
    
             standards for the registration of vehicles [and] the issuance of certificates of 
    
             title."  Aplts' App. vol. III, at 95_96 (counsel for tribe at clarification hearing). 
    
             The tribe also argues that a denial of the preliminary injunction would have 
    
             harmed the public because, under the tribal code, if the state did not grant 
    
             recognition, the tribe "would be required . . . in return to deny recognition to 
    
             state issued registrations and titles under tribal law."  Aplts' App. vol. III, at 15_
    
             16 (counsel for tribe at TRO hearing); see also PBMVC § 17_10_5(I) ("A vehicle, 
    
             even though operated upon roads within the boundaries of this Reservation, is
             
     
             
             
             
             exempt for [sic] registration when such vehicle . . . [i]s a motor vehicle currently 
    
             registered in another Jurisdiction and not required to be registered with the 
    
             Prairie Band of Potawatomi.  This exemption shall apply only to the extent that 
    
             the other Jurisdiction provides the same privileges and recognition for the tags 
    
             and titles issued by the Prairie Band Potawatomi Nation.").
    
                  We hold that the district court did not abuse its discretion in finding that 
    
             the public interest would not be adversely impacted by the issuance of the 
    
             preliminary injunction.  As discussed above, the safety issue is not as portentous 
    
             as the defendants would have it; in addition, this court's case law suggests that 
    
             tribal self_government may be a matter of public interest.  See Seneca_Cayuga, 
    
             874 F.2d at 716 ("[T]he injunction promotes the paramount federal policy that 
    
             Indians develop independent sources of income and strong self_government.").  
    
             
    
                  d.  Substantial Likelihood of Success        
    
                  Because the tribe established the above three factors to the district court's 
    
             satisfaction, it was not required to demonstrate a substantial likelihood of success 
    
             on the merits.  Rather, it had only to prove that there were "questions going to 
    
             the merits . . . so serious, substantial, difficult, and doubtful as to make the issue 
    
             ripe for litigation and deserving of more deliberate investigation."  FLLC, 195
             
     
             
             
             
             F.3d at 1194.   Again, given our deferential standard of review, we conclude that 
    
             the district court did not abuse its discretion by finding that this factor was met.
    
                  Under Supreme Court case law, federal preemption is one barrier to the 
    
             assertion of state regulatory authority over a tribe and its members.  See White 
    
             Mountain Apache Tribe v. Bracker, 448 U.S. 136, 142 (1976).  In the context of 
    
             federal Indian law, the issue of preemption typically arises when state law 
    
             conflicts with (1) an enactment of Congress pursuant to the Indian Commerce 
    
             Clause or (2) a treaty entered into by the United States and a tribe.  See 
    
             McClanahan v. State Tax Comm'n, 411 U.S. 164, 172 n.7 (1973). 
    
                  Because of "[t]he unique historical origins of tribal sovereignty[,] . . . it 
    
             [is] generally unhelpful to apply . . . standards of pre_emption that have emerged 
    
             in other areas of the law."  White Mountain, 448 U.S. at 143.  In fact, there are 
    
             special standards of preemption that apply only to federal Indian law.  For 
    
             example, "in order to find a particular state law to have been preempted by 
    
             operation of federal law, [there need not be] an express congressional statement 
    
             to that effect."  Id. at 144.  Similarly, a treaty need not contain an express 
    
             statement to have a preemptive effect.  See, e.g., McClanahan, 411 U.S. at 174_75 
    
             (noting that "[t]he treaty nowhere explicitly states that the Navajos were to be 
    
             free from state law or exempt from state taxes" but that "this Court has
             
     
             
             
             
             interpreted the Navajo treaty to preclude extension of state law ? including state 
    
             tax law ? to Indians on the Navajo Reservation").  Preemption in the context of 
    
             federal Indian law is also unique in that it rests "principally on a consideration of 
    
             the competing interests at stake" ? i.e., tribal, federal, and state interests.  New 
    
             Mexico v. Mescalero Apache Tribe, 462 U.S. 324, 334 (1983) [hereinafter New 
    
             Mexico v. Mescalero] (rejecting "a narrow focus on congressional intent to 
    
             preempt State law as the sole touchstone"). 
    
                  Another barrier to the exercise of state power is the doctrine of Indian 
    
             sovereignty.  See White Mountain, 448 U.S. at 142.  Under Supreme Court case 
    
             law, tribal sovereignty is imposed upon if the exercise of state authority 
    
             "unlawfully infringe[s] on the right of reservation Indians to make their own laws 
    
             and be ruled by them."  New Mexico v. Mescalero, 462 U.S. at 334 n.16 (internal 
    
             quotation marks omitted).  Though modern cases tend to focus more on federal 
    
             preemption to define the limits of state power, the doctrine of Indian sovereignty 
    
             has not been weeded out of federal Indian law.  Rather, it provides an essential 
    
             "backdrop against which the applicable [federal] treaties and statutes must be 
    
             read."  McClanahan, 411 U.S. at 172; see also id. at 172 n.8 ("The extent of 
    
             federal pre_emption and residual Indian sovereignty in the total absence of 
    
             federal treaty obligations or legislation is . . . now something of a moot question.
             
     
             
             
             
             The question is generally of little more than theoretical importance . . . since in 
    
             almost all cases federal treaties and statutes define the boundaries of federal and 
    
             state jurisdiction.") (citations omitted and emphasis added).
    
                  In the instant case, there are at least three possible barriers to the state's 
    
             assertions of authority with respect to motor vehicle registration and titling: 
    
             First, the various congressional enactments that demonstrate a congressional 
    
             concern with fostering tribal self_government might preempt the state laws on 
    
             registration and titling.  See White Mountain, 448 U.S. at 143 & n. 10 ("[T]his 
    
             tradition [of Indian sovereignty] is reflected and encouraged in a number of 
    
             congressional enactments demonstrating a firm federal policy of promoting tribal 
    
             self_sufficiency and economic development.").  Second, the several treaties 
    
             between the United States and the tribe, see 9 Stat. 853 (1846); 12 Stat. 1191 
    
             (1861); 15 Stat. 531 (1867); see also 1867 WL 5410 (executive order), might be a 
    
             basis for preemption, given that the treaties established the right of the tribe to a 
    
             reservation and therefore (implicitly) its right to self_govern.  See McClanahan, 
    
             411 U.S. at 174_75 ("[I]t cannot be doubted that the reservation of certain lands 
    
             for the exclusive use and occupancy of the Navajos and the exclusion of non_
    
             Navajos from the prescribed area was meant to establish the lands as within the 
    
             exclusive sovereignty of the Navajos under general federal supervision.").
             
     
             
             
             
             Finally, the doctrine of Indian sovereignty might act as a bar to state regulatory 
    
             authority, though as noted above this doctrine typically works in tandem with 
    
             federal preemption instead of as an independent barrier.(7)
    
                  The defendants argue, however, that the congressional enactments, the 
    
             treaties, and the doctrine of Indian sovereignty only support preemption of state 
    
             laws on the reservation; they say nothing about the force of state laws beyond the 
    
             reservation but still within the state.  According to the defendants, Mescalero Apache Tribe v. Jones, 411 U.S. 145 (1973) [hereinafter Mescalero], establishes 
    
             the power of the state once vehicles with tribal registrations and titles are taken 
    
             outside the reservation.  They cite the following general principle espoused in 
    
             Mescalero:  "Absent express federal law to the contrary, Indians going beyond 
    
             reservation boundaries have generally been held subject to nondiscriminatory 
    
             state law otherwise applicable to all citizens of the State."  Id. at 148_49 
    
             (emphasis added). 
    
                  Mescalero is undoubtedly an important decision to be considered in the 
    
             resolution of the case at hand, especially since Congress did not explicitly 
    
             provide that states must grant recognition to tribal registration and titling. 
    
             However, at this point, our concern is not the final merits but rather whether 
    
             there are "questions going to the merits . . . so serious, substantial, difficult, and 
    
             doubtful as to make the issue ripe for litigation and deserving of more deliberate 
    
             investigation."  FLLC, 195 F.3d at 1195.  We believe that there are.  While 
    
             Mescalero provides support for the defendants' position, we question whether it 
    
             can be applied in as broad strokes as the defendants have used, that is, without 
    
             taking into consideration the specific facts that animated the case.(8)  We reiterate
             
    
             (7)
                  In its brief, the tribe raises another possible barrier:  the Kansas 
             Admission Act.  See Kansas Admission Act  1, 12 Stat. 126, 127 (1861) 
             ("[N]othing contained in the said constitution respecting the boundary of said 
             State shall be construed to impair the rights of person or property now pertaining 
             to the Indians in said Territory, so long as such rights shall remain 
             unextinguished by treaty between the United States and such Indians, or to 
             include any territory which, by treaty with such Indian tribe, is not . . . to be 
             included within the territorial limits or jurisdiction of any State or Territory . . . 
             .").
             
                  For purposes of this opinion, we need not address this argument, though 
             the tribe is certainly entitled to present it for consideration in subsequent 
             proceedings before the district court.  We do point out, however, that this court 
             recently issued an opinion on the meaning of the Act.  See generally Sac & Fox 
             Nation of Mo. v. Pierce, 213 F.3d 566 (10th Cir. 2000), cert. denied, 121 S. Ct. 
             1078 (2001).  This court suggested in Sac & Fox that an Indian tribe could not 
             assert rights under the Act unless the tribe had a treaty with the United States that 
             reserved those rights to the tribe at the time the Act went into effect.  See id. at 
             577 ("The Act for Admission excludes from the boundaries of the State of Kansas 
             only those lands which Indian tribes reserved unto themselves `by treaty' with the 
             United States.").  
             (8)     8  The Supreme Court did state that the Mescalero principle "is as relevant to a 
             State's tax laws as it is to state criminal laws, and applies as much to tribal resorts as itdoes to fishing enterprises."  Mescalero, 411 U.S. at 149.  We do not take this statement 
             to mean, however, that the facts in Mescalero are not worthy of any consideration in 
             understanding the principle.
             
     
             
             
             
             that preemption in the context of federal Indian law is about the careful balancing 
    
             of tribal, federal, and state interests.  Depending on the facts, the interests of 
    
             these three sovereigns may vary.(9) 
    
                  We note, for example, that the tribal activity in Mescalero ? the operation 
    
             of a ski resort located outside reservation land ? was conducted clearly and 
    
             exclusively beyond the reservation, thus heightening the interests of the state. 
    
             The same, however, cannot be said of the activity in the instant case:  Here, the 
    
             activity conducted by the tribe was the registration and titling of vehicles; this 
    
             activity occurred within the reservation, not beyond, although as an ancillary consequence driving outside the reservation did occur.(10)  See Blue Lake Forest 
    
             Prods., Inc. v. Hong Kong & Shanghai Banking Corp., Ltd., 30 F.3d 1138, 1141 
    
             (9th Cir. 1994) ("Even though this case implicates an off_reservation relationship 
    
             between two non_Indian actors (Blue Lake and the bank), we deem it an 
    
             on_reservation case for purposes of preemption because the essential conduct at 
    
             issue occurred on the reservation:  the severance of timber and its removal 
    
             without proper compensation, in contravention of the governing contract and 
    
             federal regulations.  Furthermore, the Indian enterprise at the heart of this dispute 
    
             ? the timbering lands ? is located on, not off, the reservation."); People v. 
    
             McCovey, 685 P.2d 687, 697 (Cal. 1984) (en banc) (distinguishing Mescalero in 
    
             part because "the Indian activity in [Mescalero] occurred entirely off the 
    
             reservation, while this case involves on_reservation fishing followed by an off_
    
             reservation sale").
    
                  Furthermore, the activity in Mescalero is in no way comparable to the 
    
             activity in the instant case because the operation of a ski resort is not a
             
    
             (9)     9 We disagree with the Ninth Circuit's conclusion that, under Mescalero, no 
             balancing of interests takes place once the tribal activity takes place off_reservation.  See 
             Cabazon Band of Mission Indians v. Smith, No. 99_55229, 2001 WL 521436, at *2 (9th 
             Cir. May 17, 2001) [hereinafter Cabazon II] ("White Mountain's preemption analysis is 
             not applicable to off_reservation activity.").  Rather, we believe that the dissent in 
             Cabazon II had the better of it.  See id. at *8 (Browning, J., dissenting) (noting that the 
             Mescalero principle "was only a generality and not carved in stone on Mt. Sinai"; also 
             noting that the Supreme Court has not restricted the balancing_of_interests test to cases in 
             which the tribal activity is solely on_reservation).  That is, we read Mescalero to say that, 
             if the tribal activity is offreservation that fact generally tips the balancing test in favor of 
             the state (assuming there is no express federal law to the contrary).
             (10)
                  Of course, these off_reservation effects should still be taken into account 
             when it comes to the interests of the state.  See, e.g., New Mexico v. Mescalero, 
             462 U.S. at 336 (1983) ("A State's regulatory interest will be particularly 
             substantial if the State can point to off_reservation effects that necessitate State 
             intervention.").  
             
     
             
             
             
             traditional governmental function whereas the registration and titling of motor 
    
             vehicles is.  Because of this fact, the interests of the tribe are heightened, a 
    
             significant counter to the state's interests in the effects of off_reservation driving. 
    
             Which sovereign's interests are more important is not at this point a matter 
    
             appropriate for our consideration.  Instead, we merely note that Mescalero's 
    
             distinction between on_ and off_reservation activities is not necessarily 
    
             dispositive, especially in light of the doctrine of Indian sovereignty.  As the 
    
             Supreme Court has repeatedly explained, the powers of tribes extend over not 
    
             only their territory but also their members, see Atkinson Trading Co., Inc. v. 
    
             Shirley, 121 S. Ct. ___, ___ (2001) ("Indian tribes are unique aggregations 
    
             possessing attributes of sovereignty over both their members and their territory . . 
    
             . .") (internal quotation marks omitted)(11); therefore, "[u]nder some circumstances 
    
             tribal powers can extend over members going beyond reservation boundaries." 
    
             Cohen, supra, at 246 (emphasis added).  "The determinative factor is whether the 
    
             matter falls within the ambit of internal self_government."  Id.; John v. Baker,
             
    
             (11)     11  We have taken into consideration the Supreme Court's recent holding in 
             Atkinson and conclude that it does not affect the case at hand for at least two reasons:  (1) 
             Atkinson deals with the application of Montana v. United States, 450 U.S. 544 (1981), 
             while our concern here is the application of Mescalero, and (2) Atkinson deals with tribal 
             authority over nonmembers, whereas here our focus is tribal authority over members.  
                  
             
             982 P.2d 738, 752 (Alaska 1999) ("[I]n determining whether tribes retain their 
    
             sovereign powers, the United States Supreme Court looks to the character of the 
    
             power that the tribe seeks to exercise, not merely the location of events."), cert. 
    
             denied, 528 U.S. 1182 (2000).  As one district court summed up, "The extent of 
    
             tribal sovereignty . . . clearly involves more than simple geographic limits, but 
    
             includes the `tradition of Indian sovereignty over the reservation and tribal 
    
             members.'  Certain aspects of tribal sovereignty, such as tribal immunity from 
    
             suit, have been held to be so fundamental as to preempt the enforcement in court 
    
             of state laws regardless of where the activity takes place."  Cabazon Band of 
    
             Mission Indians v. Smith, 34 F. Supp. 2d 1201, 1207 (C.D. Cal. 1998) (quoting 
    
             White Mountain, 448 U.S. at 143), aff'd, Cabazon II, 2001 WL 521436.  But see 
    
             id. at *2 (criticizing the district court for making this statement based on its 
    
             conclusion that Mescalero, not White Mountain, was controlling since the tribal 
    
             activity at issue was off_reservation).
    
                  From this brief analysis of Mescalero, it should be clear that there are 
    
             indeed "questions going to the merits . . . so serious, substantial, difficult, and 
    
             doubtful as to make the issue ripe for litigation and deserving of more deliberate
             
     
             
             
             
             investigation."(12)  FLLC, 195 F.3d at 1195.  And we note that Mescalero is only 
    
             the tip of the iceberg.  As the parties have pointed out, Red Lake and Queets are 
    
             two more cases to take into consideration as, in each of these cases, a state was 
    
             compelled to extend recognition to motor vehicle registrations issued by a tribe. 
    
             See generally Red Lake, 248 N.W.2d at 722; Queets, 765 F.2d at 1399.  In 
    
             addition, the parties should take into account the federal Indian law taxation 
    
             cases, in particular, Oklahoma Tax Commission and Colville, as in both of these 
    
             cases the Supreme Court indicated that tribal members could be compelled to pay 
    
             state motor vehicle registration fees (i.e., taxes) if the fees were tailored to off_
    
             reservation use (i.e., use of the state roads).  See Oklahoma Tax Comm'n, 508 
    
             U.S. at 127_28; Colville, 447 U.S. at 162_64.  Further examination of Oklahoma 
    
             Tax Commission and Colville is certainly warranted, though their relevance may 
    
             be limited because the focus of the state's interests in those cases was revenue 
    
             and not safety (the primary concern of the defendants in the instant case).  We also note that titling was not at issue in either Oklahoma Tax Commission or 
    
             Colville, while it is contested in the case at hand.  
    
    
                  We conclude that the district court did have jurisdiction over the instant 
    
             case and that it did not abuse its discretion in granting the preliminary injunction. 
    
             Under the preliminary injunction, the defendants were enjoined from issuing 
    
             more citations but only with regard to those tribal registrations and titles already 
    
             issued prior to the grant of the preliminary injunction.  Accordingly, we 
    
             AFFIRM.
    
    
             (12)     12  We do not even address whether Mescalero's general principle is applicable in 
             the first place given that arguably the application of the state motor vehicle laws was not 
             nondiscriminatory.  See Cabazon II, 2001 WL 521436, at *9 (Browning, J., dissenting) 
             (noting that the application of the state motor vehicle laws was in fact discriminatory 
             because (1) the tribe was similarly situated to states outside California but received 
             different treatment and because (2) the state laws made an exception for one tribe but not 
             the plaintiff_tribe).  
             
    
    

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