Several individuals have been sentenced in the District of Wyoming for federal firearm, drug, and immigration offenses, according to recent court documents.
Milton Robert Petersen, 55, from Pavillion, Wyoming, received a sentence of 70 months in prison followed by three years of supervised release for being a felon in possession of firearms. Law enforcement officers executed a search warrant at his residence on March 13, 2025, finding Petersen with two rifles in a camper trailer. Petersen admitted there were numerous firearms on the property; authorities seized approximately 57 firearms during the search. The investigation was conducted by the Wyoming Division of Criminal Investigation and the FBI Rocky Mountain Safe Trails Task Force. Assistant U.S. Attorney Timothy W. Gist prosecuted the case. Petersen was indicted on July 16, 2025, pleaded guilty on October 30, 2025, and was sentenced by U.S. District Court Judge Alan B. Johnson on January 21 in Cheyenne.
Robert Dean Campbell, 50, of Cheyenne, Wyoming, was sentenced to 18 months in prison and two years of supervised release for being a felon in possession of a firearm. Campbell had previously been convicted in 2009 for possessing a firearm related to drug trafficking and violated his supervised release terms in 2021 before absconding supervision. On August 15, 2024, he was located and arrested by the U.S. Marshals Service at his girlfriend’s camper where officers found him with a Ruger 9mm pistol. The Cheyenne Police Department assisted with the investigation. Assistant U.S. Attorney Paige Hammer prosecuted this case; Campbell was indicted on July 16, 2025 and pleaded guilty on November 10, with Chief U.S. District Judge Kelly H. Rankin imposing sentence on January 30.
Jason Arnold Rohrich, age 49 from Rapid City, South Dakota received sentences for multiple offenses involving drugs and firearms that will run concurrently: he was given135 months’ imprisonment with three years’ supervised release for being a felon in possession of a firearm (Case No.25-CR-00049), as well as180 months’ imprisonment with ten years’ supervised release for possession with intent to distribute methamphetamine (Case No.25-CR-00145). On September11 ,2024 ,the Wyoming Highway Patrol stopped Rohrich’s vehicle ;he admitted having no valid license ,and officers discovered cash ,methamphetamine baggies hidden inside cups ,and a semi-automatic pistol .A subsequent traffic stop by Idaho State Police led to further methamphetamine discovery along with another handgun .Assistant U.S.Attorney Christyne M.Martens prosecuted both cases ;Rohrich pleaded guilty October21 ,2025 after indictment January28 .U.S.District Court Judge Alan B.Johnson imposed sentencing January23 .
Tyler L.Riser ,32 ,of Riverton,WY was sentenced to41 months’ imprisonment for distribution/conspiracy to distribute methamphetamine plus an additional consecutive60 months for possessing firearms during drug trafficking .He also received five years’ concurrent supervised release per count .Following an investigation into Wind River Indian Reservation drug activity,Riser’s home was searched February25 ,2025 resulting in seizure of seven firearms,cash,methamphetamine,and paraphernalia .The case involved DCI agents and FBI Rocky Mountain Safe Trails Task Force ;Assistant U.S.Attorney Timothy W.Gist prosecuted .Riser pleaded guilty May16 after indictment March20 ;sentencing occurred January28 before Judge Scott W.Skavdahl .
Juan Pedro Rangel-Ventura ,25 ,from Jalisco,Mexico received time served plus ten days pending deportation proceedings after illegal re-entry following prior removal from the United States without permission .ICE identified him June15 while he was held at Sublette County Jail ;his previous formal removal occurred November2022 .Assistant U.S.Attorney Cameron J.Cook prosecuted this matter before Chief Judge Kelly H.Rankin who imposed sentence January20 .
The United States Attorney’s Office represents the federal government across all litigation matters within Wyoming’s district courts including criminal prosecutions,civil lawsuits,and restitution collection efforts.It also manages programs aimed at public safety such as Project Safe Childhood—which targets technology-facilitated sexual exploitation crimes against children—and Operation Take Back America,a nationwide initiative focused on countering illegal immigration and organized crime.The office provides victim support through its Victim Witness Program ensuring fair treatment throughout legal proceedings.
