At issue is whether an Indian tribal police officer has authority to stop and detain a non-Indian who allegedly violates state and tribal law while traveling on a public road within a reservation until that person can be turned over to state authorities for charging and prosecution. Petitioner David P. Schmuck was found guilty of driving while intoxicated on the Port Madison Reservation after being detained by a Suquamish tribal officer and turned over *377 to the Washington State Patrol. Kitsap County Superior Court denied his appeal and affirmed the conviction. We affirm.
I
The parties have stipulated to the facts. Clerk's Papers, at 132-41, 146-50. Suquamish Tribal Police Officer Bailey is commissioned by the Suquamish Indian Tribe (Tribe) to enforce tribal laws within the geographic confines of the Port Madison Reservation (Reservation). The Port Madison Reservation is located in Kitsap County Washington.
On September 2, 1991, at approximately 7:30 p.m., Tribal Officer Bailey observed a blue Ford pickup truck traveling southbound on Brockton Avenue, a road running through the Reservation. The truck was obviously exceeding the posted 25 m.p.h. speed limit; the officer's radar reading indicated 36 m.p.h. Officer Bailey turned on his emergency lights and pursued the truck, which responded by speeding up. Officer Bailey turned on his siren and continued to follow the truck down multiple streets of the Reservation. After running a stop sign and continuing to accelerate, the truck finally came to a stop on the side of the road.
Officer Bailey approached the pickup truck, advised the driver of the reason for the stop, and requested his driver's license. The license identified the driver as petitioner, David P. Schmuck (Schmuck). Schmuck is not an enrolled member of any recognized Indian tribe, maintains no social ties with any tribe, and is not aware of any Indian ancestors.
Schmuck smelled of intoxicants. Officer Bailey asked him if he had been drinking, and Schmuck said, "I've had a few". Officer Bailey then asked him if he would be willing to take a few field sobriety tests. Schmuck declined. Because Schmuck was a non-Indian, Officer Bailey informed him that he would be detained until the Washington State Patrol could respond 1 *378 to their location to investigate whether Schmuck had been driving while under the influence of alcohol or drugs (DWI).
After some discussion, Schmuck agreed to perform some field sobriety tests. 2 After reviewing the results, Officer Bailey again advised Schmuck that he was being detained until the State Patrol arrived. At approximately 7:40 p.m., Officer Bailey requested assistance from the Washington State Patrol. Trooper Clark arrived at the scene around 8 p.m.
Trooper Clark contacted Schmuck, who was sitting in the truck, and detected a strong odor of intoxicants. Schmuck's eyes were bloodshot and watery. The trooper asked Schmuck to step from the vehicle; Schmuck complied very slowly and walked across the street to Clark's patrol car with a zigzag staggering motion.
Schmuck performed four field sobriety tests and failed them all. Based upon Officer Bailey's report of Schmuck's driving, Schmuck's performance on the field sobriety tests, and the smell of liquor, Trooper Clark advised Schmuck of his constitutional rights and placed him under arrest for DWI. Schmuck was transported to Kitsap County Jail, where he was again advised of his constitutional rights and implied consent warnings. Schmuck voluntarily waived his rights and agreed to answer questions on the alcohol arrest report form. He stated he had consumed a couple of beers, but did not believe his driving was affected by his alcohol use. A BAC Verifier DataMaster was administered at 9:11 p.m., resulting in readings of .17 and .17 grams of alcohol per 210 liters of breath. Clerk's Papers, at 148-50.
*379 On December 23, 1991, judgment was entered against Schmuck in Kitsap County District Court for driving while under the influence of intoxicating liquor in violation of RCW 46.61.502. Kitsap County Superior Court denied Schmuck's appeal and affirmed his DWI conviction, holding that the Suquamish tribal officer had authority to stop and detain Schmuck. This court granted direct review pursuant to RAP 4.2(a)(4).
II
We address three issues presented for review. First, does an Indian tribal officer have inherent authority to stop a non-Indian driving a motor vehicle on a public road within the reservation to investigate a possible violation of tribal law? Second, does a tribal officer have inherent authority to detain a non-Indian motorist who has allegedly violated state and tribal law while on the reservation until he or she can be turned over to state authorities for charging and prosecution? Third, if an Indian tribe does have such inherent authority, has that authority been divested by the State's enactment of RCW 37.12.010 assuming criminal and civil jurisdiction over the operation of motor vehicles on Indian territory and reservations?
We begin by noting that the Suquamish Indian Tribe did not assert authority to prosecute Schmuck for driving while intoxicated, speeding, or running a stop sign. Indian tribal courts do not have inherent jurisdiction to try and punish non-Indians who commit crimes on their land.
Oliphant v. Suquamish Indian Tribe,
*380 Schmuck first argues that Tribal Officer Bailey did not have inherent authority to stop Schmuck's vehicle. We disagree. A review of United States Supreme Court precedent indicates that Indian tribes are limited sovereigns which retain the power to prescribe and enforce internal criminal and civil laws. This power necessarily includes the authority to stop a driver on the reservation to investigate a possible violation of tribal law and determine if the driver is an Indian, subject to the jurisdiction of that law.
Jurisdictional disputes on Indian reservations often involve questions of overlapping federal, state, and tribal jurisdiction. See F. Cohen, Federal Indian Law ch. 6 (1982); Note, Falling Through the Cracks After Duro v. Reina: A Close Look at a Jurisdictional Failure, 15 U. Puget Sound L. Rev. 229, 230-35 (1991). Whether the Suquamish Indian Tribe has authority to stop and detain a non-Indian necessarily turns on an analysis of the limited sovereignty retained by the Tribe.
In analyzing issues of Indian sovereignty, "[i]t must always be remembered that the various Indian tribes were once independent and sovereign nations . . .."
McClanahan v. Arizona State Tax Comm'n,
The sovereignty that the Indian tribes retain is of a unique and limited character. It exists only at the sufferance of Congress and is subject to complete defeasance. But until Congress acts, the tribes retain their existing sovereign powers. In sum, Indian tribes still possess those aspects of sovereignty not withdrawn by treaty or statute, or by implication as a necessary result of their dependent status.
United States v. Wheeler,
*381
Despite their limited sovereignty, Indian tribes also have a dependent status, in which some aspects of their sovereignty have been either expressly or implicitly divested. Normally, "[a] basic attribute of hill territorial sovereignty is the power to enforce laws against all who come within the sovereign's territory, whether citizens or aliens".
Duro v. Reina,
Thus, although the status of tribes is that of a limited sovereign, tribes still retain their power of internal self-governance.
Duro,
An Indian tribe may also regulate the conduct of its members on the reservation.
Montana v. United States,
In the exercise of this recognized jurisdiction, the Suquamish Indian Tribe enacted various ordinances regulating its members' conduct upon the Reservation's roads and highways. These ordinances are codified in the Suquamish Tribal Law and Order Code (S.T.C.). These ordinances include S.T.C. 10.1.19, which authorizes tribal officers to issue citations or arrest a tribal member for driving while intoxicated or driving in a reckless and negligent manner. S.T.C. 10.1.33 and 10.1.21 require tribal members to observe posted speed limits and obey stop signs. See also S.T.C. 10.1.9 (authority to issue notice of traffic infraction).
The Suquamish Indian Tribe employs police officers, including Officer Bailey, to enforce its tribal law and order code. "The propriety of [operating]... tribal police forces has been recognized, presently and in the past, by the federal government". An Indian tribe "may employ police officers to aid in the enforcement of tribal law and in the exercise of tribal power".
Ortiz-Barraza,
Fundamental to enforcing any traffic code is the authority by tribal officers to stop vehicles violating that code on roads within a reservation. In this case, Officer Bailey was exercising the Tribe's authority to enforce its traffic code when he observed the speeding pickup truck and pursued it through the streets of the Reservation. When he first saw the truck, he had no means of ascertaining whether the driver was an
*383
Indian. Only by stopping the vehicle could he determine whether the driver was a tribal member, subject to the jurisdiction of the Tribe's traffic code. The alternative would put tribal officers in the impossible position of being unable to stop any driver for fear they would make an unlawful stop of a non-Indian. Such a result would seriously undercut the Tribe's ability to enforce tribal law and would render the traffic code virtually meaningless. It would also run contrary to the "well-established federal 'policy of furthering Indian self-government.' "
Santa Clara Pueblo v. Martinez,
We hold Suquamish Tribal Officer Bailey had the requisite authority to stop Schmuck to investigate a possible violation of the Suquamish traffic code and to determine if Schmuck was an Indian, subject to the code's jurisdiction.
Ill
Schmuck next contends that even if Tribal Officer Bailey had authority to stop him, Officer Bailey did not have inherent authority to detain him once Bailey determined that Schmuck was a non-Indian. Schmuck contends this detention violated the Washington State Constitution, article 1, section 7, in which "[n]o person shall be disturbed in his private affairs, or his home invaded, without authority of law”. (Italics ours.) We disagree. The Suquamish Indian Tribe expressly retained in its treaty the Tribe's inherent authority to detain offenders and turn them over to government officials for prosecuting. Moreover, this authority has been recognized by both the United States Supreme Court and the Ninth Circuit.
In 1855, the Tribe entered into the Treaty of Point Elliott (Treaty), Jan. 22, 1855, 12 Stat. 927, and agreed to settle on a 7,276-acre reservation near Port Madison, Washington.
Oliphant,
Prior to signing the Treaty, the Suquamish Indian Tribe began its "relationship with the Federal Government as a sovereign power" and its "criminal jurisdiction, no less than its civil jurisdiction, was that of any sovereign power".
Powers of Indian Tribes,
Article 9 of the Treaty of Point Elliott expressly provides that the Tribe shall turn over to government authorities any *385 intruder on the Reservation who has violated United States law:
the said tribes agree not to shelter or conceal offenders against the laws of the United States, but to deliver them up to the authorities for trial.
(Italics ours.) Treaty of Point Elliott, art. 9, 12 Stat. 927 (1855). This provision appears to reflect a common concern of the federal government during treaty negotiations in the mid-1800's to prevent non-Indians from hiding out on reservations in the mistaken belief that they would be free from prosecution for their crimes. See, e.g., H.R. Rep. No. 474, 23rd Cong., 1st Sess., at 98 (1834) (federal government to protect Native people from "unprincipled white men" entering Indian country, "where they fancy themselves free from punishment").
Treaty provisions reserving tribal powers are subject to certain canons of construction. Powers reserved by a tribe in its treaty may still be exercised, unless curtailed by later federal congressional action.
E.g., Wheeler,
*386
Applying these principles to the Point Elliott treaty, article 9 specifically authorizes the Suquamish Indian Tribe to detain alleged offenders of United States laws and turn them over to government officials for prosecution. Support for this authorization may be found in two opinions of the United States Supreme Court:
Oliphant v. Suquamish Indian Tribe,
Oliphant
involved crimes by two non-Indians on the Port Madison Reservation.
Oliphant,
Thus the Tribe "agree[s] not to shelter or conceal offenders against the laws of the United States, but to deliver them up to the authorities for trial." Read in conjunction with 18 U. S. C. § 1152, which extends federal enclave law to non-Indian offenses on Indian reservations, this provision implies that the Suquamish are to promptly deliver up any non-Indian offender, rather than try and punish him themselves.
(Italics ours.)
Oliphant,
Schmuck contends that the Supreme Court's decision in Oliphant bars tribal police from exercising any authority *387 over non-Indians. We disagree. Oliphant holds that tribal courts do not have criminal jurisdiction to try and punish non-Indian offenders. At the same time, the Court acknowledged the continuing vitality of the Tribe's power, reserved in article 9, to detain offenders and turn them over to governmental authorities who do have authority to prosecute.
More recently, the Supreme Court again acknowledged a tribe's power to detain.
Duro,
The tribes also possess their traditional and undisputed power to exclude persons whom they deem to be undesirable from tribal lands. . . . Tribal law enforcement authorities have the power to restrain those who disturb public order on the reservation, and if necessary, to eject them. Where jurisdiction to try and punish an offender rests outside the tribe, tribal officers may exercise their power to detain the offender and transport him to the proper authorities.
(Citations omitted. Italics ours.)
Duro,
Thus, twice the Supreme Court has stated that a tribe's proper response to a crime committed by a non-Indian on the reservation is for the tribal police to detain the offender and deliver him or her to the proper authorities. 7 This is precisely *388 what Tribal Officer Bailey did: he detained Schmuck and promptly delivered him up, in accordance with Oliphant's and Duro's directive.
In addition to the Supreme Court, the Ninth Circuit has squarely addressed the issue of tribal authority to detain a non-Indian in a case directly on point.
Ortiz-Barraza v. United States,
The Ninth Circuit held that an Indian tribe has inherent authority to stop and detain a non-Indian allegedly violating state or federal law on public roads running through the reservation until the non-Indian can be turned over to the appropriate authorities.
Ortiz-Barraza,
*389 It has at times been held that tribes may not exercise criminal jurisdiction over non-Indians. Such holdings . . . have not derogated from the sovereign power of tribal authorities to exclude trespassers who have violated state or federal law by delivering the offenders to the appropriate authorities.
(Citation omitted. Italics ours.)
Ortiz-Barraza,
The Ninth Circuit based its finding of authority, in part, on the Tribe's traditional inherent authority to exclude: "Also intrinsic in the sovereignty of an Indian tribe is the power to exclude trespassers from the reservation. A tribe needs no grant of authority from the federal government in order to exercise this power." (Citation omitted.)
Ortiz-Barraza,
Amicus Washington State Patrol argues the Suquamish Indian Tribe no longer has the power to exclude from its Reservation or the lesser included power to detain, in particular because Schmuck was traveling on a public road in the Reservation. The State Patrol argues that the language from
Duro
citing the power to exclude applies only to
tribal
land, not public roads.
See Duro,
In Ortiz-Barraza, the Ninth Circuit explicitly rejected amicus' argument that a tribe does not possess the power to detain when a non-Indian is traveling on a public road:
[T]he fact that the events of interest here may have occurred within the right-of-way for a state highway avails the defendant nothing. Rights of way running through a reservation remain part of the reservation and within the territorial jurisdiction of the tribal police.
(Italics ours.)
Ortiz-Barraza,
*390
We agree with the Ninth Circuit. Just because Schmuck's offense was committed on a public road does not mean he is immune from tribal authority. By federal statute, "Indian country" is defined as all land within the limit of any Indian reservation, "notwithstanding the issuance of any patent, and,
including
rights-of-way". (Italics ours.) 18 U.S.C. § 1151.
See, e.g., DeCoteau v. District Cy. Court,
The State Patrol argues, however, that recognizing tribal authority to detain will necessarily result in additional tribal regulation of roads running through the Reservation, such as adopting different speed limits or building toll booths. While we acknowledge the concerns of the State Patrol, we think these fears are unwarranted. Holding the Tribe has expressly reserved a limited authority to stop and detain alleged offenders in no way confers an unlimited authority to regulate the right of the public to travel on the Reservation's roads.
We also note that the Tribe's authority to stop and detain is not necessarily based
exclusively
on the power to exclude non-Indians from tribal lands, but may also be derived from the Tribe's general authority as sovereign.
See Merrion v. Jicarilla Apache Tribe,
To be sure, Indian tribes retain inherent sovereign power to exercise some forms of civil jurisdiction over non-Indians on their reservations, even on non-Indian fee lands. ... A tribe may also retain inherent power to exercise civil authority over the conduct of non-Indians on fee lands within its reservation when that conduct threatens or has some direct effect on the political integrity, the economic security, or the health or welfare of the tribe.
(Italics ours.)
Montana v. United States,
As a practical matter, the Suquamish Indian Tribe provides most of the law enforcement patrols on the Reservation. The Tribe employs five full-time officers to patrol the Reservation, whereas no state or federal law enforcement officers are assigned solely to that area. Brief of Amicus Suquamish Indian Tribe app. C. Kitsap County assigns approximately three deputies to north Kitsap County, but they must patrol an area substantially larger than the Reservation. Holding that the Tribe does not have a limited authority to stop and detain alleged offenders who present a clear threat to community members would severely hamper the Tribe's ability to protect the welfare of Indians, as well as non-Indians, on the Reservation.
In this case, if the Suquamish Indian Tribe did not have the authority to detain, Schmuck would have been free to drive away with an alcohol level exceeding the limit for legal intoxication. In the 20 minutes it took for Trooper Clark to respond, Schmuck could have easily caused extensive property damage or seriously injured other motorists. He also *392 could have left the Reservation and eluded capture by the State Patrol. As the New Mexico Court of Appeals noted:
To hold that an Indian police officer may stop offenders but upon determining they are non-Indians must let them go, would be to subvert a substantial function of Indian police authorities and produce a ludicrous state of affairs which would permit non-Indians to act unlawfully, with impunity, on Indian lands.
State v. Ryder,
Finally, the State Patrol urges this court to base a tribal officer's authority to detain on a citizen's arrest theory. We decline its invitation. There would be a serious incongruity in allowing a limited sovereign such as the Suquamish Indian Tribe to exercise no more police authority than its tribal members could assert on their own. Such a result would seriously undercut a tribal officer's authority on the reservation and conflict with Congress' well-established policy of promoting tribal self-government.
See Santa Clara Pueblo v. Martinez,
We conclude an Indian tribal officer has inherent authority to stop and detain a non-Indian who has allegedly violated state and tribal law while on the reservation until he or she can be turned over to state authorities for charging and prosecution. We hold Tribal Officer Bailey, as a police officer employed by the Suquamish Indian Tribe, had authority to stop and detain Schmuck, who was allegedly driving while intoxicated on the Reservation, until he could be turned oyer to the Washington State Patrol for charging and prosecution.
*393 IV
Schmuck contends that even if the Tribe did have inherent authority to stop and detain him, that authority was divested by the State's enactment of RCW 37.12.010. Schmuck argues that the statute gives the State
exclusive
jurisdiction over motor vehicle offenses committed on reservation land, citing
Makah Indian Tribe v. State,
By enacting RCW 37.12.010, the State , of Washington assumed criminal and civil jurisdiction over Indians and Indian territory and reservations. RCW 37.12.010. The statute specifically provides for the assumption of jurisdiction over Indians on reservations for the "operation of motor vehicles upon the public streets, alleys, roads and highways". RCW 37.12.010(8).
In
Makah,
this court held that vehicles being operated by Indians upon public roads running through a reservation are subject to jurisdictional control of the State pursuant to RCW 37.12.010.
Makah,
Makah is not dispositive. Nothing in Makah makes such a clear statement that RCW 37.12.010 grants exclusive jurisdiction to the State. The issue in Makah pertained only to questions of state jurisdiction over Indians on the Makah Reservation. It did not address issues of jurisdiction over non-Indians or exclusivity of jurisdiction.
Makah
notwithstanding, Schmuck argues that RCW 37.12.010 divested the Tribe of any authority to detain Schmuck by giving the State exclusive criminal and civil jurisdiction over Indian reservations including the operation of motor vehicles. The State does not have authority to divest the Tribe of its sovereignty; tribal sovereignty can be divested only by affirmative action of Congress.
See United States v. Wheeler,
Enacted in 1953, Public Law 280 mandated the transfer of civil and criminal jurisdiction over Indian country from the federal government to five state governments. Pub.
L.
No. 83-280, § 6, 67 Stat. 588 (1953);
Venetie,
Although legislative history on the law is sparse, Congress' primary motivation in enacting Public Law 280 was to remedy the lack of adequate criminal law enforcement on some reservations.
Venetie,
Both the United States Supreme Court and the Ninth Circuit have concluded that Public Law 280 is not a divestiture statute.
Venetie,
No court has squarely addressed the issue of whether Public Law 280 divests a tribe's authority to stop and detain non-Indian motorists allegedly violating state and tribal law while traveling on reservation roads. As noted in the above cases, however, nothing in the language or history of Public Law 280 indicates an intent by Congress to diminish tribal *396 authority. Likewise, nothing in the language of RCW 37.12-.010 affirmatively grants exclusive jurisdiction to the State. See RCW 37.12.010. In any event, because RCW 37.12.010 was enacted pursuant to Public Law 280, its scope cannot exceed that authorized by Public Law 280. Given that one of the primary goals of Public Law 280 is to improve law enforcement on reservations, holding that Public Law 280 divested a tribe of its inherent authority to detain and deliver offenders would squarely conflict with that goal.
Thus, Public Law 280, by which the State assumed jurisdiction over the operation of motor vehicles on Indian reservations, is at best ambiguous about whether that jurisdiction is exclusive or concurrent with existing tribal authority to stop and detain an alleged offender until he or she can be turned over to government authorities for prosecution. Under the rules of construction for Indian treaties, rights reserved by a tribe in its treaty may be exercised unless and until affirmatively divested by Congress.
See
Wheeler,
Accordingly, we hold that RCW 37.12.010, enacted pursuant to Public Law 280, does not divest the Suquamish Indian Tribe of its inherent authority to stop and detain a non-Indian who has allegedly violated state and tribal law while traveling on a public road in the Reservation, until he or she can be turned over to state authorities for charging and prosecution. 8
*397 The judgments of Kitsap County District Court and Kit-sap County Superior Court upholding Schmuck's DWI conviction are affirmed.
Utter, Brachtenbach, Durham, Smith, and Guy, JJ., concur.
Andersen, C.J., concurs in the result.
Notes
Tribal Officer Bailey was not cross-deputized by the Kitsap County Sheriff's Department or the Washington State Patrol. The Suquamish Tribal Police Department has not entered into a mutual aid agreement with the Kitsap County Sheriff's Department or the Washington State Patrol. Clerk's Papers, at 132. Previously, the Tribe had a cooperative agreement with Kitsap County. The County, *378 however, refused to share any of the revenue collected with the Tribe. Subsequently, the County elected not to continue a cooperative traffic enforcement program with the Tribe. Brief of Respondent, at 12 (quoting Suquamish Tribal Law and Order Code 10.1.3).
Although not included in the stipulation of facts, both parties noted in their briefs that the specific tests included a "horizontal gaze nystagmus” and a breath test on an ALCO-SENSOR portable breath testing machine. Schmuck’s breath sample registered .201. During the eye test, neither of Schmuck's eyes "pursued smoothly", and the onset of the nystagmus was prior to 45 degrees'. Brief of Petitioner, at 4-5; Brief of Respondent, at 5.
Wa note that Schmuck's assignment of error is limited to the sole question of whether the Tribe has inherent
authority
to stop and detain. He does not challenge
*380
the
reasonableness
of that detention, include any arguments in his brief, or present any evidence that the detention was in fact unreasonable. This court will not consider an issue on appeal that is not raised by an assignment of error or supported by argument and citation of authority.
McKee v. American Home Prods. Corp.,
In
Confederated Tribes,
the Ninth Circuit held the State does not have jurisdiction over tribal members on the reservation for purposes of enforcing civil traffic laws against tribal members.
Confederated Tribes,
In a case directly on point, the New Mexico Court of Appeals also looked to this language from
Oliphant
and held that an Indian tribal officer had inherent authority to detain a non-Indian offender and deliver him or her to state authorities, even though the officer was not cross-commissioned by state police.
State v. Ryder,
In 1991, Congress overruled the holding in
Duro
by passing legislation declaring that tribes possess inherent criminal jurisdiction over all Indians. Pub. L. No. 102-137, § 1, 105 Stat. 646 (1991). Nevertheless, Duro's reasoning that tribes have inherent sovereignty to detain and deliver offenders is still sound. In fact, it is supported by Congress' action in affirming tribal criminal jurisdiction over all Indians, action which is consistent with the federal policy of furthering Indian self-government.
Santa Clara Pueblo v. Martinez,
Additional support for the Supreme Court's construction of article 9 in
Oliphant
and
Duro
can be found in the dissent to the Court of Appeals' opinion in
*388
Oliphant,
which was reversed by the Supreme Court.
Oliphant v. Schlie,
It is important to focus on the precise issue in this case [Oliphant], We are not considering whether Indian tribes may pass reservation ordinances, having the force of law, governing the conduct of the tribe's members; they may.... Nor are we determining whether Indians have the right to exclude from the reservation nonmembers they deem undesirable; they have. . . . Nor is there any question of potential lawbreakers going unpunished, a point given special emphasis by the majority, for we have held that tribal authorities have the power to apprehend violators of state and federal law and to deliver the offenders to the appropriate authority. Oriz [sic]-Barraza v. United States,512 F.2d 1176 , 1179 (9th Cir. 1975).
(Footnote and citations omitted. Italics ours.)
Oliphant v. Schlie,
Our disposition makes it unnecessary for us to address petitioner's other arguments on appeal. To the extent additional arguments are raised by amici, we decline to address them. This court need not consider issues or arguments raised only by an amicus curiae.
State v. Gonzalez,
