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Question:

It is illegal for anyone over the age of 21 to operate a vehicle with a blood alcohol concentration (BAC) of ____ percent or higher.

A 0.08
Explaination

It is illegal for anyone over the age of 21 to operate a vehicle with a blood alcohol concentration (BAC) of 0.08% or higher. [Blood Alcohol Concentration (BAC) Limit; Alcohol and Drugs; California Driver Handbook]