What BAC range applies to a person under 21?

What BAC range applies to a person under 21?

• A. 0.04-0.06
• B. 0.02-0.07
• C. 0.06-0.08
• D. 0.08-0.10

Answer: (B)

The key idea is that drivers under 21 face stricter rules about drinking and driving, often described as zero tolerance. In practice, this means that even small, detectable amounts of alcohol can lead to legal trouble for someone under 21, not just when they’re visibly impaired. The range starting at 0.02% aligns with this idea: it represents the level at which underage drivers can begin to face penalties, rather than waiting for higher impairment. The upper limit around 0.07% fits the notion that penalties can apply across low-to-moderate BAC levels for those under 21, before the standard adult DUI threshold of about 0.08% is reached. The other ranges start at higher BAC levels, which would miss the under-21 rule of stricter, lower limits, or they correspond to adult DUI thresholds rather than underage rules. So the 0.02-0.07% range best matches how under-21 BAC limits are typically described.

The key idea is that drivers under 21 face stricter rules about drinking and driving, often described as zero tolerance. In practice, this means that even small, detectable amounts of alcohol can lead to legal trouble for someone under 21, not just when they’re visibly impaired.

The range starting at 0.02% aligns with this idea: it represents the level at which underage drivers can begin to face penalties, rather than waiting for higher impairment. The upper limit around 0.07% fits the notion that penalties can apply across low-to-moderate BAC levels for those under 21, before the standard adult DUI threshold of about 0.08% is reached. The other ranges start at higher BAC levels, which would miss the under-21 rule of stricter, lower limits, or they correspond to adult DUI thresholds rather than underage rules. So the 0.02-0.07% range best matches how under-21 BAC limits are typically described.