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If a preliminary alcohol screening (PAS) test of an underage California driver reveals a blood alcohol concentration (BAC) of _______ or higher, the officer may require the driver to take a second test.

A 0.05%

If a California driver under the age of 21 is found to have a BAC of 0.05% or higher in a preliminary chemical test, he or she may be required to submit to a second test. [Under 21- Zero Tolerance for Alcohol Use, Blood Alcohol Concentration (BAC) Limit, Alcohol and Drugs, California Driver Handbook]