Final answer:
A conviction of underage driving while impaired can result from any detectable alcohol due to zero-tolerance laws. Detection is often made through symptoms of intoxication or a Breathalyzer test, which measures BAC.
Step-by-step explanation:
Underage driving while impaired can lead to a conviction if the person is found operating a vehicle under the influence of alcohol or drugs. The National Minimum Drinking Age Act of 1984 requires states to set the legal drinking age at twenty-one, and violators are subject to legal penalties. A common method for determining impairment is through a Breathalyzer test, which measures the blood alcohol concentration (BAC). The legal limit for adults is typically a BAC of 0.08%, but for underage drivers, any detectable amount of alcohol may result in a conviction due to zero-tolerance laws. Factors leading to conviction include symptoms of alcohol consumption, such as poor coordination and slurred speech, and other results of intoxication such as dangerous driving behavior and accidents.