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For an underage driver, a blood alcohol concentration (BAC) of _______ gives California authorities the legal right to arrest the individual.

A 0.05%

If you are underage and your preliminary alcohol screening (PAS) test reveals a BAC of 0.05%, the officer may require you to submit to either a breath test or a blood test. If a subsequent test reveals a BAC of 0.05% or higher, the officer will issue you an order of suspension and arrest you for DUI. [Under 21- Zero Tolerance for Alcohol Use, Admin Per Se, Alcohol and Drugs, California Driver Handbook]