CDE Alcohol, Drugs & Impaired Driving 1 — Questions and Answers
Question 1: In all U.S. states, what is the legal blood alcohol concentration (BAC) limit for drivers aged 21 and older?
- 0.05%
- 0.08% (Correct answer)
- 0.10%
- 0.12%
Correct 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.
Question 2: Under zero tolerance laws, what is the BAC limit for drivers under age 21 in most U.S. states?
- 0.08%
- 0.04%
- 0.01% or 0.02% (Correct answer)
- 0.00%
Correct 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.
Question 3: Which part of the brain is most immediately affected by alcohol, impairing a driver's judgment and decision-making?
- Cerebellum
- Brainstem
- Frontal lobe (Correct answer)
- Occipital lobe
Correct answer: Frontal lobe
Alcohol first impairs the frontal lobe, which controls judgment, decision-making, and impulse control — critical functions for safe driving.
Question 4: At a BAC of 0.05%, which driving-related skills are most noticeably affected?
- Steering and braking only
- Reduced coordination, reduced ability to track moving objects, and difficulty steering (Correct answer)
- Vision only
- Reaction time only
Correct 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.
Question 5: Which of the following is the ONLY reliable way to sober up after drinking alcohol?
- Drinking coffee
- Eating a large meal
- Cold shower
- Time (Correct answer)
Correct answer: Time
Only time allows the liver to metabolize alcohol; coffee, food, and cold showers do not reduce BAC or improve driving ability.
Question 6: What does the term 'implied consent' mean in the context of driving?
- A driver agrees to obey all traffic laws
- By driving, a person consents to chemical testing if lawfully stopped for impaired driving (Correct answer)
- A passenger implies consent to be in an impaired driver's vehicle
- Police may search a vehicle without a warrant
Correct 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.
Question 7: Which schedule of drugs does the DEA classify marijuana as, and what does this mean for drugged driving enforcement?
- Schedule II — states cannot enforce drugged driving laws
- Schedule I — it is federally illegal and states use per se or zero tolerance standards for THC (Correct answer)
- Schedule III — it is legal for driving if medically prescribed
- Schedule IV — only a civil infraction to drive under its influence
Correct 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.
CDE Alcohol, Drugs & Impaired Driving 1
In all U.S. states, what is the legal blood alcohol concentration (BAC) limit for drivers aged 21 and older?