Law Enforcement Traffic Control and DUI 3 — Questions and Answers
Question 1: A preliminary breath test (PBT) administered roadside is primarily used to do what?
- Provide conclusive courtroom evidence
- Establish probable cause for arrest (Correct answer)
- Replace a blood test entirely
- Determine the exact criminal charge
Correct answer: Establish probable cause for arrest
A PBT helps establish probable cause for arrest but is generally not admissible as conclusive evidence at trial.
Question 2: Which clue is an officer trained to observe during the Walk-and-Turn test?
- Pupil dilation
- Stepping off the line (Correct answer)
- Eye jerking
- Breath odor
Correct answer: Stepping off the line
Stepping off the line is one of the standardized divided-attention clues in the Walk-and-Turn test.
Question 3: What does a flashing red traffic signal require a driver to do?
- Proceed without stopping
- Slow down and proceed with caution
- Stop, then proceed when safe (Correct answer)
- Make a U-turn
Correct answer: Stop, then proceed when safe
A flashing red signal requires the driver to come to a full stop and proceed only when safe, like a stop sign.
Question 4: An officer smells alcohol and sees an open container in a stopped vehicle. This primarily supports what?
- An automatic conviction
- Probable cause to investigate further (Correct answer)
- A mandatory vehicle impound
- An immediate license revocation
Correct answer: Probable cause to investigate further
These observations support probable cause to continue a DUI investigation, not an automatic conviction.
Question 5: What does a flashing yellow traffic signal indicate to a driver?
- Come to a complete stop
- Proceed with caution (Correct answer)
- Road is closed ahead
- Reverse direction
Correct answer: Proceed with caution
A flashing yellow signal means slow down and proceed with caution.
Question 6: During the One-Leg Stand test, for approximately how long is a subject typically asked to hold the position?
- 5 seconds
- 10 seconds
- 30 seconds (Correct answer)
- 60 seconds
Correct answer: 30 seconds
The One-Leg Stand test typically requires holding the position for about 30 seconds while counting.
Question 7: What is the most accurate and direct method of measuring blood alcohol concentration?
- Breath test
- Urine test
- Blood test (Correct answer)
- Field sobriety test
Correct answer: Blood test
A blood test directly measures alcohol concentration and is generally the most accurate chemical test.
Law Enforcement Traffic Control and DUI 3
A preliminary breath test (PBT) administered roadside is primarily used to do what?