Final answer:
In New Jersey, the legal limit for BAC when driving for individuals over 21 is 0.08%, in compliance with the National Minimum Drinking Age Act of 1984. A Breathalyzer measures a person's BAC, with higher BAC levels leading to severe intoxication and health risks.
Step-by-step explanation:
In New Jersey, it is illegal for individuals who are 21 years of age or older to drive with a BAC (Blood Alcohol Concentration) of 0.08% or higher. This is in line with the standards set by the National Minimum Drinking Age Act of 1984, which, while primarily establishing the minimum drinking age, has influenced states to adopt the 0.08% BAC legal limit. The Breathalyzer is a common tool used by law enforcement to measure BAC. It operates on the principle of oxidizing ethanol in the breath, giving an approximation of the blood alcohol level. Alcohol intoxication can bring not only legal consequences but also physiological effects, with BAC levels surpassing 0.20% leading to acute intoxication, around 0.30% causing unconsciousness, and approximately 0.50% being potentially lethal.