Which BAC value is used to presume DUI for drivers age 21 and older in California?

Which BAC value is used to presume DUI for drivers age 21 and older in California?

• A. 0.10%
• B. 0.12%
• C. 0.05%
• D. 0.08%

Answer: (D)

In California, for drivers age 21 and older, the number 0.08% BAC is the per se limit for DUI. That means if you’re operating a vehicle with a BAC of 0.08% or higher, the law treats you as DUI based on the BAC alone, without needing to prove additional impairment. The higher the BAC above that level, the stronger the presumption of intoxication. Lower values aren’t automatic DUI for adults, though impairment can still lead to a DUI charge if the officer observes symptoms or uses field tests. The other numbers aren’t the default per se threshold for adults in California, though different rules apply to other groups (commercial drivers have a 0.04% limit, and those under 21 have a zero-tolerance-like limit around 0.01% or higher).

In California, for drivers age 21 and older, the number 0.08% BAC is the per se limit for DUI. That means if you’re operating a vehicle with a BAC of 0.08% or higher, the law treats you as DUI based on the BAC alone, without needing to prove additional impairment. The higher the BAC above that level, the stronger the presumption of intoxication.

Lower values aren’t automatic DUI for adults, though impairment can still lead to a DUI charge if the officer observes symptoms or uses field tests. The other numbers aren’t the default per se threshold for adults in California, though different rules apply to other groups (commercial drivers have a 0.04% limit, and those under 21 have a zero-tolerance-like limit around 0.01% or higher).