MO DMV Alcohol and Drug Impairment Laws 3 — Questions and Answers
Question 1: What is the BAC limit for drivers operating a commercial motor vehicle in Missouri?
- 0.04% (Correct answer)
- 0.08%
- 0.02%
- 0.05%
Correct answer: 0.04%
Commercial drivers are held to a stricter 0.04% BAC limit while operating a CMV.
Question 2: By driving on Missouri roads, you have automatically agreed to:
- Submit to a chemical test of breath, blood, saliva, or urine if arrested for DWI (Correct answer)
- Carry proof of sobriety at all times
- Allow police to search your vehicle at any time
- Attend an alcohol education course annually
Correct answer: Submit to a chemical test of breath, blood, saliva, or urine if arrested for DWI
Missouri's Implied Consent law means all drivers agree to chemical testing when lawfully arrested for an intoxication offense.
Question 3: A driver convicted of a second intoxication-related offense in Missouri may be required to install what device?
- An ignition interlock device (Correct answer)
- A GPS speed limiter
- A dashboard camera
- A breath test kit in the trunk
Correct answer: An ignition interlock device
Repeat DWI offenders must install an ignition interlock device that prevents the engine from starting if alcohol is detected.
Question 4: Approximately how much alcohol is in a standard 12-ounce beer compared to a 1.5-ounce shot of 80-proof liquor?
- About the same amount of alcohol (Correct answer)
- The beer has twice as much
- The shot has three times as much
- The beer has almost no alcohol
Correct answer: About the same amount of alcohol
A standard beer, glass of wine, and shot of liquor each contain roughly the same amount of alcohol.
Question 5: Which of the following is the ONLY effective way to remove alcohol from the body?
- Time (Correct answer)
- Drinking black coffee
- Taking a cold shower
- Eating a large meal
Correct answer: Time
Only time allows the liver to metabolize alcohol; coffee, showers, and food do not speed up the process.
Question 6: A driver under 21 with a BAC of 0.02% or higher on a first offense faces what license action in Missouri?
- A 90-day suspension (Correct answer)
- A one-year revocation
- A written warning only
- No action until a second offense
Correct answer: A 90-day suspension
Under the Zero Tolerance law, a first offense brings a 90-day suspension for underage drivers.
Question 7: Driving while intoxicated by illegal drugs in Missouri is:
- Treated as a DWI offense just like alcohol impairment (Correct answer)
- A lesser offense than alcohol DWI
- Only illegal if drugs are found in the vehicle
- Handled only as a drug possession charge
Correct answer: Treated as a DWI offense just like alcohol impairment
Missouri's DWI statute covers impairment by alcohol, drugs, or any combination of both.
MO DMV Alcohol and Drug Impairment Laws 3
What is the BAC limit for drivers operating a commercial motor vehicle in Missouri?