Patrol Procedures and Operations
The vehicle stop is the backbone of patrol
Most patrol questions are really officer-safety and legal-authority questions in scenario clothing. Sequence matters: choose a location that gives a tactical advantage without creating a hazard, radio plate and location before activating lights, and approach with a plan for the unknown, which is every stop.
Know the controlling rules. Under Pennsylvania v. Mimms you may order the driver out of a lawfully stopped vehicle, and under Maryland v. Wilson, passengers as well; that is a safety order, not a search. Passengers are seized for Fourth Amendment purposes (Brendlin) and may challenge the stop. A frisk of the passenger compartment for weapons requires reasonable suspicion that the occupant is armed and dangerous (Michigan v. Long); the stop alone does not supply it.
DUI detection is heavily tested. The stop must be justified before you request a test, and a prolonged detention needs reasonable suspicion of impairment (75 Pa.C.S. § 6308). The SFST battery is standardized: HGN, walk-and-turn, one-leg stand. Administer it as trained or not at all, because every deviation becomes cross-examination. Implied consent (75 Pa.C.S. § 1547) makes refusal a civil license suspension, not a crime; a first refusal is generally twelve months, longer for repeat refusals. Know the thresholds: .08 general impairment, .16 higher rate, .02 for minors, .04 for commercial drivers.
Traps: assuming a traffic stop authorizes a vehicle search; treating probable cause to stop as probable cause to search; forgetting that a sobriety checkpoint must follow a neutral, predetermined plan (Commonwealth v. Tarbert); and ignoring the Steer Clear duty (75 Pa.C.S. § 3327) to move over or slow down for stopped emergency vehicles.
Rule of thumb: before you step out of the car, state your legal basis in one sentence and know what you will do if it changes. If you cannot say the sentence, you do not have the basis.