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Washington Personal Driver Knowledge Test
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Safe & Responsible DrivingStandalone practice
Driver A is 35 years old. At what breath or blood alcohol concentration does the law treat Driver A as driving under the influence, even if Driver A seems to drive normally?
Correct answer: 0.08 or more
Why
The 0.08 level is not a safe level. A driver below 0.08 can still be arrested for DUI if alcohol or a drug affects the driving. For cannabis, a THC level of 5.00 nanograms or more is DUI for drivers aged 21 and older.
Verified against Washington Driver Guide · Driving under the influence (DUI) · p. 37, 38
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