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Idaho Class D Knowledge Practice Test
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Safe & Responsible DrivingStandalone practice
At what BAC does Idaho’s alcohol-concentration offense begin for a driver under 21?
Correct answer: 0.02 percent
Why
For drivers under 21, 0.02 percent is the start of Idaho’s alcohol-concentration offense. The special underage provision covers 0.02 to less than 0.08; 0.08 or above is covered by the general DUI provision. No alcohol concentration is a safe target for driving.
Verified against Idaho Driver’s Handbook, July 2026 · Under-21 BAC threshold · p. 131
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