Bill to toughen DUI penalties working its way through the MT Legislature We are continuing our look at Montanaâs drunk driving laws and if they are effective enough to keep us safe on the road. and last updated 2021-04-05 17:03:19-04 MISSOULA â We are continuing our look at Montanaâs drunk driving laws and if they are effective enough to keep us safe on the road. Data from the Montana Department of Justice from 2019 shows that 58% of all fatalities were the result of impaired driving. If thereâs any good news here, itâs that that number is down from 64% from the year before. Still, as a state, our track record for drunk driving deaths is dismal.