KY POST study materials
KY POST study resources

KY POST key terms

KY POST · Get comfortable with the vocabulary.

Terry stop (investigative detention)

A brief seizure of a person based on reasonable suspicion of criminal activity, during which an officer may ask questions and, if warranted by safety concerns, conduct a limited pat-down for weapons.

Related: Reasonable suspicion, Stop and frisk, Probable cause
Reasonable suspicion

Specific, articulable facts plus rational inferences that would lead a reasonable officer to believe criminal activity is afoot or has occurred; a lower standard than probable cause.

Related: Terry stop (investigative detention), Totality of the circumstances
Probable cause

Facts and circumstances that would lead a reasonable person to believe an offense has been committed and that a particular person committed it, or that evidence will be found in a specific place.

Related: Arrest warrant, Search warrant affidavit, Exclusionary rule
Exclusionary rule

The doctrine barring the prosecution from using evidence obtained through unconstitutional government action, subject to exceptions such as good faith, inevitable discovery, and attenuation.

Related: Fruit of the poisonous tree, Inevitable discovery, Probable cause
Fruit of the poisonous tree

Derivative evidence discovered only because of an earlier unconstitutional search or seizure; it is generally suppressed unless an exception breaks the causal link.

Related: Exclusionary rule, Inevitable discovery, Consent search
Miranda warning

Advice given before custodial interrogation that the suspect may remain silent, that statements may be used against them, and that counsel is available; waiver must be knowing, voluntary, and intelligent.

Related: Custodial interrogation, Voluntariness, Sixth Amendment right to counsel
Custodial interrogation

Questioning or its functional equivalent by officers after a person has been formally arrested or restrained to a degree associated with arrest, triggering Miranda requirements.

Related: Miranda warning, Voluntariness
Totality of the circumstances

The standard of judging an event by all surrounding facts rather than any single factor, used for reasonable suspicion, probable cause, consent, and voluntariness analyses.

Related: Reasonable suspicion, Voluntariness, Consent search
Consent search

A warrantless search permitted when a person with authority over the area gives voluntary consent; the state must prove voluntariness, and consent may be limited or withdrawn.

Related: Totality of the circumstances, Fruit of the poisonous tree
Plain view doctrine

Allows warrantless seizure of evidence when an officer is lawfully present, the item's incriminating character is immediately apparent, and the officer has lawful access to it.

Related: Probable cause, Exigent circumstances
Exigent circumstances

Urgent conditions such as imminent danger, hot pursuit, or likely destruction of evidence that justify a warrantless entry or search otherwise requiring a warrant.

Related: Plain view doctrine, Community caretaking
Community caretaking

The non-investigative role of police in protecting the public, such as checking on stranded motorists or persons in distress; it can justify limited intrusion without criminal suspicion.

Related: Exigent circumstances, Emergency aid doctrine
Emergency aid doctrine

Permits warrantless entry when officers reasonably believe a person inside is seriously injured or in imminent danger and needs immediate assistance.

Related: Community caretaking, Exigent circumstances
Graham v. Connor objective reasonableness

The constitutional use-of-force test asking whether a reasonable officer on the scene, judged from that moment without hindsight, would have used similar force under the totality of the circumstances.

Related: Objective reasonableness factors, Deadly force, Totality of the circumstances
Objective reasonableness factors

Judicial considerations for force: severity of the crime, immediate threat to officers or others, and active resistance or flight, weighed with the totality of the circumstances.

Related: Graham v. Connor objective reasonableness, Proportionality in force, De-escalation
Deadly force

Force that a reasonable officer knows or should know creates a substantial risk of causing death or serious bodily injury; its use is narrowly limited by law and policy.

Related: Tennessee v. Garner, Graham v. Connor objective reasonableness, Proportionality in force
Tennessee v. Garner

Supreme Court decision holding that deadly force may not be used to prevent the escape of a fleeing suspect unless the officer has probable cause the suspect poses a significant threat of death or serious injury.

Related: Deadly force, Objective reasonableness factors
De-escalation

Techniques such as time, distance, cover, communication, and tactical repositioning used to reduce the likelihood of force or lower its intensity when feasible.

Related: Proportionality in force, Objective reasonableness factors
Proportionality in force

The principle that the level and duration of force used should correspond to the threat and resistance actually presented, and should stop when resistance stops.

Related: De-escalation, Deadly force
Duty to intervene

The obligation of officers to stop and report excessive force by another officer when they observe it and have a realistic opportunity to act.

Related: Proportionality in force, Brady material
Brady material

Exculpatory or impeaching evidence in the government's possession that must be disclosed to the defense under the constitutional guarantee of due process.

Related: Chain of custody, Duty to intervene
Chain of custody

The documented, unbroken record of who handled evidence, when, and for what purpose, from collection through court presentation, used to show integrity and authenticity.

Related: Brady material, Evidence log
Evidence log

A written record listing each item collected, its description and location, the collector, and every transfer, supporting later testimony about the item's condition.

Related: Chain of custody, Report narrative
Report narrative

The chronological, first-person account in a police report describing what the officer observed, said, and did, using specific facts and avoiding conclusions or opinions.

Related: Evidence log, Use-of-force report
Use-of-force report

A required written account documenting the circumstances, type, duration, and effects of force used, and the officer's observations and de-escalation efforts before it.

Related: Report narrative, Duty to intervene
Arrest warrant

A judicial order authorizing seizure of a named or described person based on sworn facts showing probable cause that the person committed an offense.

Related: Probable cause, Search warrant affidavit
Search warrant affidavit

The sworn written statement of facts presented to a judge to establish probable cause for a search, describing the place, items, and supporting circumstances.

Related: Probable cause, Arrest warrant
Kentucky open records and public disclosure

State law governing release of government records, including police reports, subject to statutory exemptions for active investigations, personal privacy, and juvenile matters.

Related: Juvenile confidentiality, Report narrative
Juvenile confidentiality

Statutory and policy limits on releasing records and identifying information about minors in the juvenile justice system, protecting rehabilitation over public exposure.

Related: Kentucky open records and public disclosure, Mandatory reporting
Mandatory reporting

The legal duty of officers and other professionals to notify designated authorities of suspected child abuse, neglect, or other specified harms.

Related: Juvenile confidentiality, Duty to intervene
Emergency vehicle operation privileges

Statutory allowances for authorized emergency vehicles, such as proceeding past signals, exceeding speed limits, or parking, available only when using lights and siren and with due regard for safety.

Related: Due regard for safety, Pursuit policy
Due regard for safety

The legal standard requiring emergency drivers to operate with reasonable care for the safety of others despite statutory exemptions from certain traffic laws.

Related: Emergency vehicle operation privileges, Pursuit policy
Pursuit policy

Agency rules governing when and how officers may pursue fleeing vehicles, including authorization, supervisory control, termination criteria, and permissible tactics.

Related: Emergency vehicle operation privileges, Due regard for safety
Racial profiling

Selecting or treating a person for enforcement action based on race, ethnicity, or national origin rather than behavior or specific, credible information.

Related: Procedural justice, Implicit bias
Implicit bias

Unconscious associations or attitudes that can influence perception, decisions, and behavior; recognizing them supports fair and consistent enforcement.

Related: Racial profiling, Procedural justice
Procedural justice

The idea that people accept police authority more readily when decisions are made through fair processes, with voice, neutrality, respect, and trustworthy motives.

Related: Racial profiling, Implicit bias
Chain of command

The formal hierarchy through which orders, information, and accountability flow, from line officers through supervisors to the chief executive.

Related: Unity of command, Span of control
Unity of command

The supervisory principle that each subordinate reports to one clear supervisor for a given task, preventing conflicting orders and unclear accountability.

Related: Chain of command, Span of control
Span of control

The number of subordinates a supervisor can effectively direct, which varies with task complexity, officer experience, and geographic dispersion.

Related: Chain of command, Unity of command
Early intervention system

A data-based supervisory tool that flags officers showing patterns of complaints, force, or crashes and prompts review, training, or counseling before problems escalate.

Related: Span of control, Use-of-force report
Wellness and peer support

Programs and practices addressing officer physical and mental health, including critical incident stress debriefing, confidential peer support, and access to employee assistance resources.

Related: Duty to intervene, Early intervention system