Alcohol, Drugs & Impaired Driving Flashcards

In all U.S. states, what is the legal blood alcohol concentration (BAC) limit for drivers aged 21 and older?

Answer: 0.08%

The legal BAC limit for drivers 21 and older is 0.08% in every U.S. state, established through federal legislation in 2000.

Under zero tolerance laws, what is the BAC limit for drivers under age 21 in most U.S. states?

Answer: 0.01% or 0.02%

Zero tolerance laws set the BAC limit for underage drivers at 0.01% or 0.02%, making it effectively illegal to drive after consuming any alcohol.

Which part of the brain is most immediately affected by alcohol, impairing a driver's judgment and decision-making?

Answer: Frontal lobe

Alcohol first impairs the frontal lobe, which controls judgment, decision-making, and impulse control — critical functions for safe driving.

At a BAC of 0.05%, which driving-related skills are most noticeably affected?

Answer: Reduced coordination, reduced ability to track moving objects, and difficulty steering

At 0.05% BAC, drivers experience reduced coordination, reduced ability to track moving objects, and difficulty steering, according to NHTSA research.

Which of the following is the ONLY reliable way to sober up after drinking alcohol?

Answer: Time

Only time allows the liver to metabolize alcohol; coffee, food, and cold showers do not reduce BAC or improve driving ability.

What does the term 'implied consent' mean in the context of driving?

Answer: By driving, a person consents to chemical testing if lawfully stopped for impaired driving

Implied consent laws mean that by operating a vehicle on public roads, drivers automatically consent to chemical sobriety testing when lawfully requested.

Which schedule of drugs does the DEA classify marijuana as, and what does this mean for drugged driving enforcement?

Answer: Schedule I — it is federally illegal and states use per se or zero tolerance standards for THC

Marijuana is a Schedule I controlled substance; states enforce drugged driving with per se THC limits or zero tolerance standards since impairment testing is complex.