Drivers over the age of 21 are considered to be driving under the influence if their blood alcohol concentration (BAC) is:

.02 or more.
.04 or more.
.08 or more.
.01 or more.
Explanation

In California, it is illegal to operate a motor vehicle with a BAC of 0.08 percent or higher, if the driver is 21 years old or older, and with BAC of 0.01 percent or higher, if the driver is under 21 years old.

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