POST POST - Peace Officer Standards and Training Traffic Law and Enforcement 2 — Questions and Answers
Question 1: What blood alcohol concentration (BAC) level is the legal limit for non-commercial adult drivers in the United States?
- 0.04%
- 0.06%
- 0.08% (Correct answer)
- 0.10%
Correct answer: 0.08%
The legal BAC limit for non-commercial drivers age 21 and older is 0.08% in all U.S. states.
Question 2: What are the three NHTSA-standardized field sobriety tests (SFSTs)?
- Walk-and-turn, finger-to-nose, and balance test
- Horizontal gaze nystagmus, walk-and-turn, and one-leg stand (Correct answer)
- Breathalyzer, blood test, and urine test
- Counting backwards, alphabet recitation, and eye-tracking test
Correct answer: Horizontal gaze nystagmus, walk-and-turn, and one-leg stand
NHTSA recognizes the Horizontal Gaze Nystagmus (HGN), walk-and-turn, and one-leg stand as the three validated standardized field sobriety tests.
Question 3: Under California's implied consent law, what must a driver do when lawfully arrested for DUI?
- May refuse any chemical test without legal penalty
- Must submit to a chemical test of blood or breath (Correct answer)
- Must submit only to a blood test
- Must wait for an attorney before agreeing to any testing
Correct answer: Must submit to a chemical test of blood or breath
California's implied consent law requires drivers lawfully arrested for DUI to submit to a chemical test; refusal results in automatic license suspension.
Question 4: During an HGN (Horizontal Gaze Nystagmus) test, what is the officer observing?
- Pupil dilation caused by drug use
- Involuntary jerking of the eyes as they track a moving stimulus (Correct answer)
- Redness in the whites of the eyes indicating intoxication
- The ability to smoothly track two separate objects simultaneously
Correct answer: Involuntary jerking of the eyes as they track a moving stimulus
HGN testing detects involuntary jerking (nystagmus) of the eyes as they follow a moving stimulus, which is associated with alcohol and certain drug impairment.
Question 5: A DUI suspect is unconscious and unable to consent to a blood draw; under what legal doctrine may an officer proceed without a warrant?
- Plain view doctrine
- Exigent circumstances (Correct answer)
- Inevitable discovery doctrine
- Good faith exception
Correct answer: Exigent circumstances
Exigent circumstances — including a medical emergency or the natural dissipation of blood alcohol — may justify a warrantless blood draw.
Question 6: What is the BAC limit for drivers under 21 years of age in California?
- 0.08%
- 0.05%
- 0.04%
- 0.01% (Correct answer)
Correct answer: 0.01%
California's zero-tolerance law prohibits drivers under 21 from operating a vehicle with a BAC of 0.01% or higher.
POST POST - Peace Officer Standards and Training Traffic Law and Enforcement 2
What blood alcohol concentration (BAC) level is the legal limit for non-commercial adult drivers in the United States?