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.