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Question:

In Pennsylvania, a driver who is under 21 years of age can be charged with driving under the influence of alcohol (DUI) if his or her blood alcohol concentration (BAC) is ______ or higher.

A 0.02%
Explaination

In Pennsylvania, a driver who is under 21 years of age can be charged with driving under the influence of alcohol (DUI) if his or her blood alcohol concentration (BAC) is 0.02% or higher. Most people will reach a BAC of 0.02% or higher after consuming just one standard alcoholic drink. (One standard drink equals about 12 ounces of beer, 5 ounces of wine, or 1.5 ounces of 80-proof liquor.) [What Constitutes a DUI (Driving Under the Influence); Driving Under the Influence of Alcohol or a Controlled Substance; Chapter 4: Driving; Pennsylvania Driver's Manual]