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KY POST: Patrol Procedures and Traffic Enforcement

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Patrol Procedures and Traffic Enforcement

What this domain tests

Whether you can make a lawful stop, keep it lawful, and build a dui or traffic case that survives suppression. The exam rewards precise standards and correct Kentucky Vehicle Code citations.

Core rules

  • Stop authority. A traffic violation, however minor, justifies a stop (Whren v. United States). The stop is a seizure; its scope must match the reason for it.
  • Control of occupants. Order the driver out (Pennsylvania v. Mimms) and passengers out (Maryland v. Wilson); frisk only on reasonable suspicion of armed danger (Arizona v. Johnson).
  • Duration. You may not extend the stop beyond its mission without reasonable suspicion (Rodriguez v. United States). A dog sniff is fine only if it does not prolong the stop (Illinois v. Caballes).
  • Kentucky statutes. KRS 189.290 careless driving; KRS 189.390 speed limits; KRS 189.380 following too closely; KRS 189.292 texting; KRS 189.125 seat belts with primary enforcement; KRS 189.930 move-over duty for stopped emergency vehicles.
  • DUI detection. Use the NHTSA three phases (vehicle in motion, personal contact, pre-arrest screening) and the validated SFST battery - horizontal gaze nystagmus, walk and turn, one-leg stand. A preliminary breath test supports probable cause; evidentiary testing runs through implied consent (KRS 189A.103).

Worked example

You stop a car for an expired registration. Registration and license checks finish in four minutes. The driver's hands shake and he avoids eye contact. That is nervousness, not reasonable suspicion of drugs. Continuing to question him for ten more minutes about narcotics unlawfully extends the stop, and anything seized may be suppressed. If, however, you see a baggie in plain view during the lawful check, the analysis changes.

Traps

  • Calling nervousness reasonable suspicion.
  • Forgetting that a frisk needs its own justification.
  • Mixing a preliminary breath result with admissible evidentiary testing.
  • Missing the move-over duty when working a stop on the shoulder yourself.