NYS Trooper study materials
NYS Trooper study resources

NYS Trooper key terms

NYS Trooper · Get comfortable with the vocabulary.

Probable Cause

The level of facts and circumstances that would lead a reasonable officer to believe a crime has been, is being, or will be committed, or that evidence of a crime will be found in a particular place.

Related: Reasonable Suspicion, Arrest Warrant, Search Warrant
Reasonable Suspicion

A lower threshold than probable cause in which specific, articulable facts, taken with rational inferences, suggest criminal activity; it justifies a brief investigative stop and limited frisk for weapons.

Related: Probable Cause, Stop and Frisk, Terry Stop
Terry Stop

A brief, involuntary detention based on reasonable suspicion during which an officer may ask questions and, if warranted, pat down outer clothing for weapons; named for the court decision establishing the standard.

Related: Reasonable Suspicion, Stop and Frisk, Investigative Detention
Stop and Frisk

The practice of briefly detaining a person on reasonable suspicion and patting down outer clothing only to locate weapons, not to search for contraband generally.

Related: Terry Stop, Reasonable Suspicion
Search Warrant

A court order, supported by sworn probable cause, authorizing officers to search a specified place or person for specified evidence and to seize items listed in the order.

Related: Probable Cause, Affidavit, Exigent Circumstances
Arrest Warrant

A court order directing law enforcement to take a named person into custody based on a showing of probable cause that the person committed an offense.

Related: Probable Cause, Custodial Arrest
Exigent Circumstances

Urgent conditions, such as imminent danger to life, hot pursuit of a suspect, or likely destruction of evidence, that permit warrantless action that would otherwise require a warrant.

Related: Search Warrant, Warrantless Search
Warrantless Search

A search conducted without a warrant under a recognized exception, such as consent, search incident to arrest, plain view, automobile exception, or exigency.

Related: Exigent Circumstances, Search Incident to Arrest, Plain View Doctrine
Search Incident to Arrest

A warrantless search of an arrestee's person and the area within immediate reach, permitted to remove weapons and prevent destruction of evidence.

Related: Custodial Arrest, Warrantless Search
Plain View Doctrine

The rule allowing an officer lawfully present in a location to seize evidence of a crime without a warrant when its incriminating character is immediately apparent.

Related: Warrantless Search, Probable Cause
Custodial Arrest

The taking of a person into custody for the purpose of charging them with an offense, triggering rights such as being informed of the charges and appearing before a court.

Related: Arrest Warrant, Miranda Warning
Miranda Warning

The advisement of the right to remain silent, that statements may be used against the person, the right to counsel, and the right to appointed counsel, required before custodial interrogation.

Related: Custodial Interrogation, Custodial Arrest
Custodial Interrogation

Questioning by law enforcement of a person in custody that is reasonably likely to elicit an incriminating response, which requires prior Miranda warnings.

Related: Miranda Warning, Custodial Arrest
Chain of Custody

A documented, unbroken record of who handled evidence, when, and for what purpose, from seizure through final disposition, used to show the evidence is authentic and unaltered.

Related: Evidence Collection, Property and Evidence Log
Evidence Collection

The systematic identification, documentation, preservation, and packaging of physical items at a scene so they remain admissible and unaltered.

Related: Chain of Custody, Crime Scene Preservation
Crime Scene Preservation

Steps taken to secure a scene, limit access, protect perishable evidence, and record original conditions before anything is moved or collected.

Related: Evidence Collection, Chain of Custody
Affidavit

A written statement of facts sworn to under oath, often used to support a request for a warrant or to record an officer's observations.

Related: Search Warrant, Probable Cause
Information Report

A written report documenting observations, incidents, or intelligence that may not involve an arrest or charge, used for records and later reference.

Related: Incident Report, Field Notes
Incident Report

A formal written account of an event an officer responded to, capturing who, what, when, where, how, and the action taken, in chronological order.

Related: Information Report, Field Notes, Report Narrative
Report Narrative

The narrative section of a report that tells the story of the incident in clear chronological order, using objective language and distinguishing observation from hearsay.

Related: Incident Report, Field Notes
Field Notes

Contemporaneous written or recorded notes made at the scene, used to refresh memory and to draft a complete report; they may be discoverable.

Related: Report Narrative, Incident Report
Freedom of Information Law

New York's public records law requiring agencies to disclose records on request, subject to exemptions such as personal privacy, active investigations, and public safety.

Related: Records Retention, Redaction
Redaction

The removal or obscuring of protected information, such as personal identifiers or victim data, from a record before release, with the basis noted.

Related: Freedom of Information Law, Records Retention
Records Retention

The schedule governing how long particular records must be kept and when they may be destroyed, based on legal, administrative, and evidentiary needs.

Related: Freedom of Information Law, Redaction
Vehicle and Traffic Law

New York's statute governing operation of vehicles, licensing, equipment, and traffic rules; violations range from traffic infractions to misdemeanors and felonies.

Related: Traffic Infraction, DWI
Traffic Infraction

A minor violation of traffic law that is not a crime, such as speeding or failing to signal, generally resolved by fine rather than arrest or jail.

Related: Vehicle and Traffic Law, Traffic Stop
Traffic Stop

The lawful detention of a vehicle based on reasonable suspicion of a traffic violation or other offense, during which the officer controls the scope and duration of the encounter.

Related: Reasonable Suspicion, Traffic Infraction
DWI

Driving while intoxicated or impaired by alcohol or drugs; investigation includes standardized field sobriety tests, chemical testing, and documentation of observations.

Related: Standardized Field Sobriety Test, Implied Consent
Standardized Field Sobriety Test

A validated battery of roadside tests, including horizontal gaze nystagmus, walk-and-turn, and one-leg stand, administered to assess impairment and support probable cause.

Related: DWI, Probable Cause
Implied Consent

The legal principle that a licensed driver has agreed in advance to submit to a chemical test of breath, blood, or urine when lawfully arrested for impaired driving.

Related: DWI, Standardized Field Sobriety Test
Accident Investigation

The systematic response to a collision, including scene safety, injury care, measurement, witness interviews, and documentation of contributing factors.

Related: Accident Report, Traffic Stop
Accident Report

The official form recording a motor vehicle collision, including parties, vehicles, injuries, damage, conditions, and contributing factors.

Related: Accident Investigation, Incident Report
Radio Dispatch

The assignment of calls to units by a dispatcher, including location, nature of the call, and safety information, with acknowledgment and status updates from the unit.

Related: Call Priority, Scene Safety
Call Priority

The classification of a 911 call by urgency, which determines response order, resources assigned, and whether lights and siren are used.

Related: Radio Dispatch, Emergency Vehicle Operation
Scene Safety

The ongoing assessment and control of hazards at a call, including threats from persons, traffic, weather, and structures, before and during contact.

Related: Radio Dispatch, Crime Scene Preservation
Emergency Vehicle Operation

Driving a patrol vehicle in emergency mode with lights and siren, subject to due regard for public safety and department policy on speed and right-of-way.

Related: Call Priority, Vehicle Pursuit
Vehicle Pursuit

An attempt by an officer to apprehend a fleeing vehicle, governed by policy limits, supervisor authorization, and continuous balancing of risk to the public.

Related: Emergency Vehicle Operation, Call Priority
Use of Force

The application of physical control, tools, or weapons to gain compliance, which must be objectively reasonable, necessary, and proportional to the threat presented.

Related: Scene Safety, De-escalation
De-escalation

Techniques such as communication, time, distance, and tactical repositioning used to reduce the intensity of an encounter and avoid unnecessary force.

Related: Use of Force, Scene Safety