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About.com Health's Disease and Condition content is reviewed by Steven Gans, MD

Definition: All 50 states now have laws that make it illegal for persons under age 21 to drive with any amount of alcohol in their system. These laws penalize persons under 21 for operating a vehicle with a BAC of .00 (if the arresting officer detects the smell of alcohol) or with negligible BAC levels such as .01 or .02 percent.

Also Known As: Zero Tolerance BAC Laws

Examples: Although she only had one beer, she was arrested for DUI under the state's zero tolerance law.