SOCE Traffic Stops and Enforcement 2 — Questions and Answers

Question 1: When an officer activates emergency lights to stop a vehicle and the driver does not immediately pull over, the officer should:

Immediately pursue at high speed
Follow department pursuit policy, continue radio communication, and monitor the vehicle's speed (Correct answer)
Disable the patrol vehicle's lights to reapproach covertly
Immediately request spike strips without supervisor notification

Correct answer: Follow department pursuit policy, continue radio communication, and monitor the vehicle's speed

Failure to yield situations should be handled per department pursuit policy, with continuous communication with dispatch and a supervisor to authorize pursuit escalation.

When a driver fails to yield to emergency lights, the officer must immediately notify dispatch and begin evaluating whether a pursuit is justified and authorized under department policy. Most agencies require supervisor authorization to initiate or continue a pursuit. Officers must weigh the seriousness of the offense, road/weather/traffic conditions, identification of the vehicle and occupants, risks to the public, and available backup. Unilateral high-speed pursuit without policy compliance exposes the agency to significant civil liability and creates public safety risks. Many agencies have restrictive pursuit policies limiting pursuits to violent felony suspects only.

Question 2: During a traffic stop, the officer requests the driver's license, registration, and proof of insurance. The driver produces the license but cannot find the registration or insurance. The officer should:

Immediately arrest the driver for driving without documentation
Run the license and vehicle registration check through dispatch to verify current status (Correct answer)
Physically search the vehicle for the documents without further process
Issue a citation for all three violations before running any records checks

Correct answer: Run the license and vehicle registration check through dispatch to verify current status

The officer should run the license and vehicle registration through dispatch — registration and insurance can be verified electronically, and the check may reveal outstanding warrants or other issues.

Most jurisdictions allow electronic verification of registration and insurance status through law enforcement databases. Before deciding on enforcement action, the officer should run the driver's license and license plate through dispatch or the in-car computer to check: driver's license validity and status, vehicle registration status, insurance verification (in states with electronic insurance verification programs), outstanding warrants, and prior contacts. The results inform what enforcement action, if any, is appropriate. Immediate arrest for missing documents is not appropriate unless the license is confirmed suspended/revoked or other criminal indicators exist.

Question 3: Which field sobriety test (FST) is specifically designed to test eye movement abnormalities caused by alcohol or drug impairment?

Walk and Turn test
One Leg Stand test
Horizontal Gaze Nystagmus test (Correct answer)
Romberg Balance test

Correct answer: Horizontal Gaze Nystagmus test

The Horizontal Gaze Nystagmus (HGN) test measures involuntary eye jerking (nystagmus) that is exaggerated by alcohol and certain drugs affecting the central nervous system.

Horizontal Gaze Nystagmus (HGN) is one of three Standardized Field Sobriety Tests (SFSTs) validated by NHTSA. During HGN, the officer moves a stimulus (pen or finger) horizontally while the subject tracks it with their eyes. The officer looks for: lack of smooth pursuit (jerking movement when following the stimulus), distinct nystagmus at maximum deviation (eye held to the side), and onset of nystagmus prior to 45 degrees from center. Each eye can show up to 3 clues — 4 or more out of 6 total clues indicates probable DUI. HGN is involuntary and cannot be controlled by the subject, making it a reliable physiological indicator. It is also the most reliable of the three SFSTs, with approximately 88% accuracy.

Question 4: An officer stops a driver for speeding and notices an open container of alcohol in the cup holder. The officer should:

Issue only a speeding citation and note the open container
Investigate further for DUI — conduct field sobriety tests, obtain PBT, and assess the driver (Correct answer)
Confiscate the container and release the driver with a verbal warning
Immediately arrest the driver for DUI without further investigation

Correct answer: Investigate further for DUI — conduct field sobriety tests, obtain PBT, and assess the driver

An open container provides reasonable suspicion to investigate DUI. The officer should conduct SFSTs, use a preliminary breath test if available, and gather facts before making an arrest decision.

An open alcohol container in the passenger compartment establishes probable cause for an open container violation and reasonable suspicion to investigate for DUI. The investigation should include: observing the driver for signs of impairment (bloodshot eyes, slurred speech, odor of alcohol, unusual behavior), administering standardized field sobriety tests (HGN, Walk and Turn, One Leg Stand), requesting a preliminary breath test (PBT) if available, and documenting all observations. The arrest decision for DUI should be based on the totality of evidence — the open container alone is not proof of DUI. Officers must build a documented, objective case rather than acting on assumption.

Question 5: A properly performed traffic stop approach includes which of the following safety steps?

Walking directly to the driver's window without pausing
Activating emergency lights, parking behind the stopped vehicle at an offset angle, and approaching cautiously (Correct answer)
Asking the driver to exit the vehicle before the officer exits the patrol unit
Stopping directly behind the vehicle to block it from reversing

Correct answer: Activating emergency lights, parking behind the stopped vehicle at an offset angle, and approaching cautiously

Safe traffic stop approach includes: emergency lights on, patrol unit positioned offset and behind the stopped vehicle, and a cautious approach — giving the officer cover and visibility of the vehicle interior.

Traffic stop approach safety elements: (1) Activate emergency lights (and spotlight at night) to warn other traffic and illuminate the vehicle. (2) Park offset — typically 12–15 feet behind and 3 feet to the left of the stopped vehicle — this places the patrol unit between the officer and traffic and angles the headlights into the vehicle's interior. (3) Before exiting, observe the vehicle for movement (passengers rearranging, doors opening). (4) Approach along the driver's side (or passenger side tactically), staying aware of blind spots. (5) On approach, scan the vehicle interior for weapons, additional occupants, and the driver's hands. (6) Position slightly behind the B-pillar for cover. Stopping directly behind a vehicle creates a crush/reverse hazard.

Question 6: Under what circumstances may an officer conduct a search of a vehicle during a traffic stop?

Any time the officer believes something may be hidden inside
With consent, probable cause, lawful arrest, or exigent circumstances (Correct answer)
Only with a signed warrant from a magistrate
Whenever the driver has a prior criminal conviction

Correct answer: With consent, probable cause, lawful arrest, or exigent circumstances

Vehicle searches during traffic stops are lawful only under established exceptions: consent, probable cause, search incident to lawful arrest, or exigent circumstances.

Warrantless vehicle searches are governed by the automobile exception (Carroll v. United States, 1925) and its progeny. Lawful bases include: (1) Consent — must be voluntary and can be limited or withdrawn, (2) Probable cause — reasonable belief the vehicle contains contraband or evidence of a crime (odor of marijuana, visible contraband, credible informant tip), (3) Search incident to lawful arrest — may search the area within the arrestee's immediate control, though Arizona v. Gant (2009) limited this to situations where the arrestee could access the car or when it is reasonable to believe evidence of the arrest offense will be found, (4) Exigent circumstances. An officer's 'belief' without specific articulable facts or a prior record alone is insufficient.

SOCE Traffic Stops and Enforcement 2

When an officer activates emergency lights to stop a vehicle and the driver does not immediately pull over, the officer should: