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Question:

What is the legal BAC limit in the state of Arizona for drivers under the age of 21?

A None
Explaination

The state of Arizona's legal Blood Alcohol Concentration limit is 0.00% for any driver under the age of 21. Any trace of alcohol in underage drivers' systems will result in driver's license suspension. [DUI Penalties, Driving Under the Influence, Section 5, Arizona Driver License Manual]