California Car / Permit practice question · Alcohol & Drugs

Under California's "zero tolerance" law, a driver under 21 may not drive with a BAC at or above:

Answer choices

• 0.08%
• 0.05%
• 0.01%— Correct answer
• 0.04%

Why this is the answer

Drivers under 21 may not drive with a BAC of 0.01% or higher. This is far stricter than the 0.08% limit for adults over 21, so one drink can put a young driver over it. The 0.04% figure applies to commercial drivers and drivers carrying passengers for hire, not to people under 21 in general.

Source: California Driver Handbook — Zero Tolerance Law

Content reviewed against official driver handbooks · August 12, 2026