W. Cooper v. DOJ, DCI

2026 MT 4
CourtMontana Supreme Court
DecidedJanuary 13, 2026
DocketDA 25-0414
StatusPublished
AuthorMcKinnon

This text of 2026 MT 4 (W. Cooper v. DOJ, DCI) is published on Counsel Stack Legal Research, covering Montana Supreme Court primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.

Bluebook
W. Cooper v. DOJ, DCI, 2026 MT 4 (Mo. 2026).

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

2 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

3 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.

4 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

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2026 MT 4, Counsel Stack Legal Research, https://law.counselstack.com/opinion/w-cooper-v-doj-dci-mont-2026.