W. Cooper v. DOJ, DCI

2026 MT 4
Montana Supreme Court·Decided January 13, 2026·No. DA 25-0414·Published·McKinnon

Opinion

01/13/2026

DA 25-0414

Case Number: DA 25-0414

IN THE SUPREME COURT OF THE STATE OF MONTANA 2026 MT 4

WESLEY THOMAS COOPER, Petitioner and Appellant, v.

MONTANA DEPARTMENT OF JUSTICE, DIVISION OF CRIMINAL INVESTIGATION,

Respondent and Appellee.

APPEAL FROM: District Court of the Nineteenth Judicial District, In and For the County of Lincoln, Cause No. DV 24-206 Honorable Matthew J. Cuffe, Presiding Judge

COUNSEL OF RECORD:

For Appellant:

Colin M. Stephens, Stephens Brooke, P.C., Missoula, Montana For Appellee:

Austin Knudsen, Montana Attorney General, Helena, Montana Caitlin S. Williams, Assistant Attorney General, Missoula, Montana

Submitted on Briefs: October 29, 2025 Decided: January 13, 2026

Justice Laurie McKinnon delivered the Opinion of the Court.

¶1 Wesley Thomas Cooper (Cooper) appeals from the May 21, 2025 Order issued by the Nineteenth Judicial District of Montana, Lincoln County, which denied his writ of prohibition against the Montana Department of Justice (DOJ) and required him to register in Montana as a sex offender based on his conviction and the underlying charging documents for Sexual Assault in North Dakota.

¶2 We restate the issues on appeal as follows:

1. Whether the District Court erred when it concluded that the proper avenue of relief from a duty to register as a sex offender in Montana was a petition for removal under § 46-23-506, MCA, and not a petition for a writ of prohibition.

2. Whether the District Court erred in relying on allegations not proved beyond a reasonable doubt or admitted by the defendant when it concluded that Cooper had a duty to register as a sex offender.

3. Whether N.D. Cent. Code § 12.1-20-07, “Sexual Assault,” is reasonably equivalent to a “Sexual Offense” as defined by § 46-23-502(9)(a), MCA (2015), for the purpose of imposing a duty to register as a sex offender.

¶3 We reverse and remand with instructions.

FACTUAL AND PROCEDURAL BACKGROUND

¶4 In November 2017, Cooper was charged by Information in North Dakota with Gross Sexual Imposition, a felony, in violation of N.D. Cent. Code § 12.1-20-03(1)(d). The charging document alleged that Cooper, age 22 at the time, “engaged in penile-vaginal contact and/or digital-vaginal contact with Jane Doe,” whose year of birth was 2013. A person is guilty of Gross Sexual Imposition in North Dakota if the person “engages in a sexual act with another” when the victim is less than fifteen years old. Cooper entered a

plea of not guilty before ultimately entering into a plea agreement with the State of North Dakota. In May 2019, Cooper entered a guilty plea to the offense of Sexual Assault, a misdemeanor, in violation of N.D. Cent. Code § 12.1-20-07(1)(a). A person is guilty of Sexual Assault under N.D. Cent. Code § 12.1-20-07(1)(a) if they knowingly had sexual contact with another person and know or have reasonable cause to believe that the contact was offensive to the other person. In his plea agreement, Cooper admitted that “on, about, or between October 1, 2016[,] and April 30, 2017, . . . [he] had inappropriate contact with Jane Doe and had reasonable cause to believe that the contact was offensive to that person.” The court sentenced Cooper to a 360-day jail sentence, all suspended, and 2 years of supervised probation. The court further assessed Cooper with $325 in fees and ordered him to undergo a psychosexual evaluation through a licensed counselor. Cooper has complied with the court’s sentencing requirements. Cooper’s plea agreement expressly stated that he was not required to register as a sex offender because Sexual Assault is exempted as an offense requiring registration pursuant to N.D. Cent. Code § 12.1-32-15(1)(g).

¶5 Cooper moved to Montana in 2019, started a family, and opened a business. In October 2024, Cooper received a letter from the DOJ advising him that he was required to register as a sex offender pursuant to Montana’s sex offender registration requirements set forth in § 46-23-502, MCA. The DOJ advised that Cooper’s offense in North Dakota is reasonably equivalent to Montana’s 2019 Sexual Assault statute since both statutes share the elements of knowingly engaging in sexual contact with another. Montana requires a person found guilty of Sexual Assault to register as a sex offender when the victim is less

than 16 years old and the offender is three or more years older than the victim. The DOJ concluded that Cooper was required to register as a sex offender based on the alleged age of the victim in the Information. Cooper subsequently moved back to North Dakota and filed a petition for a writ of prohibition in the 19th Judicial District Court of Montana seeking judicial intervention from the DOJ’s requirement that he register as a sex offender.

STANDARD OF REVIEW

¶6 “A district court’s decision to issue or deny a writ of prohibition is a conclusion of law regarding the application of a statute, which we review for correctness.” Allied Waste Servs. of N. Am., LLC v. Dep’t of Pub. Serv. Regul., 2019 MT 199, ¶ 12, 397 Mont. 85, 447 P.3d 463. We review a district court’s interpretation and application of a statute and its conclusions of law for correctness. Langford v. State, 2013 MT 265, ¶ 10, 372 Mont. 14, 309 P.3d 933.

¶7 Similar to the question of whether a prior conviction can be used to enhance a criminal sentence, whether a person has a duty to register as a sex offender is a question of law, which we review de novo for correctness. See State v. Lund, 2020 MT 53, ¶ 6, 399 Mont. 159, 458 P.3d 1043. When reviewing questions of constitutional law, including whether a person’s due process rights were violated, “this Court reviews the district court’s conclusion to determine whether its interpretation of the law was correct.” State v. Spady, 2015 MT 218, ¶ 12, 380 Mont. 179, 354 P.3d 590.

DISCUSSION

¶8 1. Whether the District Court erred when it concluded that the proper avenue of relief from a duty to register as a sex offender in Montana was a petition for removal under § 46-23-506, MCA, and not a petition for a writ of prohibition.

¶9 “The writ of prohibition is the counterpart of the writ of mandate. It arrests the proceedings of any tribunal, corporation, board, or person exercising judicial functions when such proceedings are without or in excess of the jurisdiction of such tribunal, corporation, board, or person.” Kimble Props., Inc. v. State Dep’t of State Lands, 231 Mont. 54, 56, 750 P.2d 1095, 1096 (1988) (quoting § 27-27-101, MCA). This Court has a “strong disinclination to grant writs of prohibition.” Kimble Props., Inc., 231 Mont. at 56, 750 P.2d at 1096. A writ of prohibition is “justified by extreme necessity,” Bitterroot River Prot. Ass’n v. Bitterroot Conservation Dist., 2002 MT 66, ¶ 22, 309 Mont. 207, 45 P.3d 24 (citations omitted), and only available where there is not a “plain, speedy, and adequate remedy in the ordinary course of law.” Malta Irrigation Dist. v. Mont. Bd. of Health & Env’t Scis., 224 Mont. 376, 379, 729 P.2d 1323, 1325 (1986) (quoting § 27-27-102, MCA). An alternative remedy “is neither speedy nor adequate if its slowness is likely to produce immediate injury or mischief.” Malta Irrigation Dist., 224 Mont. at 381, 729 P.2d at 1326 (citations omitted). A remedy is speedy when, on the other hand, “having in mind the subject matter involved, it can be pursued without expedition and without essential detriment to the party aggrieved.” Malta Irrigation Dist., 224 Mont. at 381, 729 P.2d at 1326 (citations omitted).

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