Final answer:
If a driver under 21 has a BAC of 0.05% or higher, they will be arrested and have their license suspended in accordance with the laws enforced by the National Minimum Drinking Age Act of 1984.
Step-by-step explanation:
If a law enforcement officer finds that a driver under 21 has a blood alcohol concentration (BAC) of 0.05% or higher, the officer will arrest the driver and suspend his or her license. It is important to note that the National Minimum Drinking Age Act of 1984 requires states to enforce a minimum drinking age of twenty-one, and driving with a BAC above the limit set by state law is illegal.
Alcohol intoxication is defined legally by a BAC level, and officers use tests such as the Breathalyzer to measure this. The immediate effect of alcohol depends on the BAC, which varies by individual. For those under the age of 21, most states enforce Zero Tolerance laws, which means that any detectable amount of alcohol is grounds for a DUI charge.