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Montana Class D Knowledge Test Practice
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Safe & Responsible DrivingStandalone practice
Driver A is 19 years old. What is the lowest blood alcohol concentration (BAC) at which Driver A breaks Montana's DUI law for drivers under 21?
Correct answer: 0.02%
Why
In Montana, a person must be 21 or older to buy or drink alcohol, and the low 0.02 limit means even a small amount can lead to a DUI charge. New drivers are affected by alcohol more than experienced drivers because they are still learning to drive. The safe rule is simple: if you are under 21, do not drink, and never drive after drinking.
Verified against Montana Driver Manual English · Alcohol and the law · p. 82, 81
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