Law Enforcement Traffic Control and DUI 2 — Questions and Answers
Question 1: What is the per se blood alcohol concentration (BAC) limit for non-commercial drivers age 21 and over in all U.S. states?
- 0.05%
- 0.08% (Correct answer)
- 0.10%
- 0.12%
Correct answer: 0.08%
A BAC of 0.08% is the legal per se limit for adult non-commercial drivers in every U.S. state.
Question 2: Which test is most commonly used as a Standardized Field Sobriety Test (SFST) and measures involuntary eye jerking?
- Walk-and-Turn
- One-Leg Stand
- Horizontal Gaze Nystagmus (Correct answer)
- Finger-to-Nose
Correct answer: Horizontal Gaze Nystagmus
Horizontal Gaze Nystagmus measures the involuntary jerking of the eyes that becomes pronounced under alcohol impairment.
Question 3: Under implied consent laws, what is the typical consequence of refusing a chemical test after a lawful DUI arrest?
- Immediate dismissal of charges
- Administrative license suspension (Correct answer)
- A verbal warning only
- Mandatory community service
Correct answer: Administrative license suspension
Implied consent laws impose an automatic administrative license suspension for refusing a chemical test.
Question 4: When directing traffic at an intersection, what does an officer's raised palm facing a driver mean?
- Speed up
- Turn right
- Stop (Correct answer)
- Proceed straight
Correct answer: Stop
A raised open palm facing the driver is the universal signal to stop.
Question 5: What is the lower 'zero tolerance' BAC limit commonly applied to drivers under age 21?
- 0.08%
- 0.05%
- 0.02%
- 0.00% to 0.02% (Correct answer)
Correct answer: 0.00% to 0.02%
Zero tolerance laws set the limit for underage drivers at 0.00% to 0.02% depending on the state.
Question 6: During a DUI stop, which observation would NOT typically establish reasonable suspicion before the stop?
- Weaving across lane lines
- Driving with a passenger asleep (Correct answer)
- Driving at night with no headlights
- Nearly striking a curb repeatedly
Correct answer: Driving with a passenger asleep
A sleeping passenger is not evidence of impaired driving, unlike erratic vehicle movements.
Question 7: What is the legal BAC limit for commercial drivers operating a commercial vehicle in the U.S.?
- 0.08%
- 0.04% (Correct answer)
- 0.02%
- 0.10%
Correct answer: 0.04%
Commercial drivers are held to a stricter 0.04% BAC limit while operating commercial vehicles.
Law Enforcement Traffic Control and DUI 2
What is the per se blood alcohol concentration (BAC) limit for non-commercial drivers age 21 and over in all U.S. states?