In California, it is illegal for a person under the age of 21 to operate a vehicle with a minimum blood alcohol content (BAC) of:

In California, the legal drinking age is 21. For persons below this age, it is illegal to operate any motor vehicle with a BAC of 0.01 percent or higher. It may be unsafe to ride a motorcycle after consuming any amount of alcohol, even if the rider is under the legal limit.

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