Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. The arrest counts are the ones each agency reported to the FBI, as the FBI held them on October 8, 2026. Every office link was opened and checked against the office's own site between September 24, 2026 and September 30, 2026.
Blaine County, Montana, has about 6,900 residents (2024 Census Bureau estimate). A DUI arrest in Blaine County starts two cases, a criminal case in a Justice or Municipal Court and a license case before the Motor Vehicle Division, and leaves three records. This guide follows the arrest from the roadside to the court file and the driving record.
This guide covers the law, the arrest, booking, the court case, the license case, the records and common questions.
Related guides: Blaine County public records, Blaine County arrest records, Blaine County warrants, Blaine County criminal records, Blaine County court records, Montana arrest records and Montana inmate search.
The DUI Law in Montana
Drunk driving is charged as DUI in Montana, at a blood alcohol level of 0.08 or more.
Driving in Montana is consent to a breath or blood test when an officer has cause to suspect DUI; the license case that follows a refusal or a failed test is run by the Motor Vehicle Division, separately from the criminal case.
Who Makes DUI Arrests in Blaine County
The Blaine County Sheriff's Office and the agency that reports for Chinook make the DUI arrests in Blaine County.
Together, the two agencies in Blaine County with all twelve months of 2025 on file reported 18 arrests to the FBI that year, all offenses together; the FBI's count for Blaine County does not break DUI out.
Booking After a DUI Arrest in Blaine County
A driver arrested for DUI and kept in custody goes to the county jail, whichever agency made the arrest.
The Court Case
The case is heard in a Justice or Municipal Court, brought by the County Attorney or, in a municipal court, by the city's own prosecutor.
The County Attorney's page SearchSystems verified is at blainecounty-mt.gov/attorney, phone 406-357-3220.
The court records page SearchSystems verified for the county is at blainecounty-mt.gov/district-court, phone 406-357-3230.
Montana has no single public index of every trial court case; each court's records are looked up through that court.
The License Case
A DUI arrest starts two cases: the criminal one above and an administrative one over the license, run by the Motor Vehicle Division. The driving record, kept by the Montana Motor Vehicle Division, carries the result of both.
The Records a DUI Leaves
- The arrest report: from the agency that made the arrest, under the Montana Public Records Act.
- The court file: from a Justice or Municipal Court, kept by the Clerk of District Court.
- The driving record: from the Montana Motor Vehicle Division.
More on each: Blaine County arrest records, Blaine County police reports and Blaine County court records.
Frequently Asked Questions
What is the DUI limit in Montana?
0.08 percent blood alcohol.
Where is a DUI case from Blaine County heard?
In a Justice or Municipal Court. The court records page SearchSystems verified for the county is at blainecounty-mt.gov/district-court.
Where is a person arrested for DUI in Blaine County held?
At the county jail, run by the Blaine County Sheriff's Office, if kept in custody.
Who handles the license after a DUI arrest in Montana?
The Motor Vehicle Division, in an administrative case separate from the court case.
Is this the official Blaine County website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official county, court and state offices described above and does not hold records, charge for them or take requests.