Montana

Adult criminal records for cases in which you were convicted are eligible for expungement or confidentiality in some situations.   

• If you were convicted of a misdemeanor, the record can be expunged five years after you complete your last sentence or when the expungement is needed for military enlistment or promotion. You have to file a petition in court to start the process, and it is up to the judge whether or not to grant your petition. You can have more than one misdemeanor expunged at a time, but all of the misdemeanors have to be included in the same petition. 
• If you were convicted of prostitution or any other non-violent offense because you were a victim of human trafficking, your conviction can be vacated, and the record can be made confidential immediately. You have to file a petition in court to start the process, and it is up to the judge whether or not to grant your petition. 
• If you were the victim of identity theft and someone used your name when committing a crime, the record can be expunged immediately. You have to file a petition in court to start the process. 
• If your conviction for a sexual or violent offense is reversed, records kept under the Sexual or Violent Offender Registration Act should be expunged immediately.  
• Records of a person with one or more misdemeanor offenses, whether in one court or multiple courts and whether in one case or multiple cases, and who has not had their records previously expunged, can be expunged.