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Idaho Class D Knowledge Practice Test
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Safe & Responsible DrivingStandalone practice
For a noncommercial Idaho driver age 21 or older, which BAC reaches the per se DUI threshold?
Correct answer: 0.08 percent or more
Why
For this noncommercial adult, 0.08 percent or more meets the numerical DUI threshold. A valid officer-requested test below 0.08 generally prevents alcohol-only prosecution, subject to the statute’s exceptions. Drug impairment can still support a DUI charge, and different rules apply when there is no test or the test is unreliable or inadmissible. Do not drive after drinking.
Verified against Idaho Driver’s Handbook, July 2026 · Adult BAC threshold · p. 131
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