Montana's DUI laws prohibit driving while under the influence of drugs or alcohol. Read more about how DUI is defined in Montana and the penalties you'll face for a first, second, and third conviction.
If a Montana driver has two prior DUIs within a lifetime, a subsequent DUI will be considered a third offense. (Priors are counted differently for determining what qualifies as a first and second offense.) A third DUI conviction is a misdemeanor in Montana and—depending on the circumstances—can carry with it fines, license suspension, jail time, and vehicle forfeiture.
If you're arrested for driving under the influence (DUI) and you have three or more prior convictions or the current offense involved an accident, you may be facing felony charges and possible prison time
Montana law prohibits operating a motorboat while under the influence of drugs or alcohol. The term “motorboat” means “a vessel, including a personal watercraft or pontoon, propelled by any machinery, motor, or engine of any description, whether or not the machinery, motor, or engine is the principal source of propulsion.” (Mont. Code Ann.
Montana law prohibits any person from knowingly possessing an open alcoholic beverage container in a vehicle on a highway or public road. This restriction applies to all persons within the car, including the driver and passengers.