PA POST key terms

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. It is the standard for arrests and most warrants.

A specific, articulable basis, grounded in facts plus officer training and experience, for suspecting criminal activity. It permits a brief investigative detention but not a full search or arrest.

A brief, involuntary detention of a person based on reasonable suspicion of criminal activity, during which the person may be questioned and, if officer safety requires, patted down for weapons. Named for Terry v. Ohio.

A limited pat-down of a person's outer clothing for weapons, permitted during a lawful detention when the officer reasonably believes the person is armed and dangerous. Its purpose is officer safety, not evidence collection.

A court rule barring the prosecution from using evidence obtained through unconstitutional government action, such as an unlawful search or coerced confession. It is meant to deter police misconduct.

A set of rights an officer must advise a suspect of before custodial interrogation: the right to remain silent, that statements may be used against them, the right to counsel, and appointed counsel if indigent. Waiver must be knowing and voluntary.

Questioning by police that the suspect reasonably perceives as likely to produce incriminating answers, conducted after the person has been deprived of freedom in a significant way. It triggers the Miranda requirement.

A court order, supported by probable cause shown in an affidavit, authorizing officers to search a specified place or person and seize specified items. It must be executed within the time limits and scope the law allows.

A judicial order directing officers to take a named person into custody based on a showing of probable cause. It authorizes entry into the suspect's own residence when there is reason to believe the suspect is inside.

A documented, unbroken record of who handled physical evidence, when, and where, from seizure through trial. Gaps or inconsistencies can allow the defense to challenge authenticity and admissibility.

A running written record listing each item of evidence collected, its identifying number, description, collector, date, time, and location. It supports the chain of custody and later testimony about the item.

A written statement of facts sworn or affirmed under oath before a person authorized to administer oaths. Officers commonly use one to establish probable cause for a search or arrest warrant.

The specific facts the prosecution must prove beyond a reasonable doubt for a conviction, typically including the prohibited act, the mental state, causation, and any required result or attendant circumstance.

The physical or external component of a crime: a voluntary act, an omission where a legal duty exists, or a prohibited state of possession. It must accompany the required mental state.

The mental state or guilty mind required for a particular offense, such as intentionally, knowingly, recklessly, or with criminal negligence. The level required varies by statute and must be proven for each element.

A warrantless search permitted when a person with authority over the area gives voluntary consent, free from coercion or duress. The person may limit the scope of the search and may withdraw consent at any time.

A rule allowing officers lawfully present in a location to seize evidence of a crime that is immediately apparent without a further search. The officer must have a lawful right of access to the item.

The lawful removal and storage of a vehicle by police, typically for safekeeping, evidence, or because the driver is arrested or unlicensed. Department policy and statute govern when impound and inventory are permitted.

A standardized, non-investigative examination of a lawfully impounded vehicle's contents, conducted under written policy to protect the owner's property and the department from claims. It must not be a pretext for evidence gathering.

The documented decision and paperwork allowing a vehicle to be towed, including the legal basis, location, time, and requesting officer. It supports later testimony and protects against liability claims.

A standardized roadside assessment, such as the horizontal gaze nystagmus, walk-and-turn, or one-leg stand, used with other observations to develop probable cause for impaired driving. Results must be documented precisely.

The legal principle that a licensed driver has already agreed to submit to a chemical test of breath, blood, or urine when lawfully arrested for impaired driving. Refusal typically triggers license consequences and may be used at trial.

The amount of force objectively necessary and proportionate to effect a lawful purpose, such as an arrest or self-defense, judged from the perspective of a reasonable officer on the scene. It excludes force used to punish.

The Fourth Amendment standard for judging force, asking whether the officer's actions were reasonable given the totality of circumstances known at the time, without regard to hindsight or subjective intent.

Force that is intended or likely to cause death or serious bodily injury. It may be used only when objectively reasonable to prevent imminent death or serious injury to the officer or another person.

A framework describing escalating levels of resistance and the corresponding officer responses, from presence and verbal direction through control holds, intermediate weapons, and deadly force. Officers may move between levels as circumstances change.

Techniques such as time, distance, cover, calm communication, and tactical repositioning used to reduce the intensity of a situation and lower the need for force when feasible and safe.

The standard requiring review of all facts and events known to the officer at the time, rather than any single factor in isolation, when judging probable cause, force, or reasonable suspicion.

A group of officers specially trained to respond to people experiencing behavioral health crises, emphasizing verbal engagement, referral to services, and reduced reliance on arrest or force when appropriate.

A communication skill involving full attention, paraphrasing, reflecting feelings, and clarifying questions so the speaker feels heard. It helps calm agitated people and gather accurate information.

The idea that people judge police encounters by whether the process is fair: whether they are given voice, treated with dignity, and see neutral, transparent decision-making. It builds voluntary compliance and trust.

The public's belief that police authority is rightful and should be obeyed. It grows from fair treatment, consistent standards, and accountability, and it reduces the need for coercion.

An approach in which officers build ongoing partnerships with residents and organizations to identify and solve local problems, rather than responding only to calls after harm occurs.

The practice of making enforcement decisions based only on behavior and specific, credible information, never on race, ethnicity, religion, gender, or other protected characteristics. It includes monitoring one's own implicit associations.

An officer's obligation to stop a fellow officer's clearly excessive force or other misconduct when in a position to do so, and to report it through proper channels. Many agencies impose this duty by policy and law.

An informal norm among some officers of not reporting or testifying against colleagues' misconduct. It undermines accountability, public trust, and the integrity of investigations, and is prohibited by professional standards.

The prosecution's constitutional duty to turn over material exculpatory or impeaching evidence to the defense. Officers must report and preserve such information, including credibility issues, accurately.

Driving a patrol vehicle in response to an emergency, permitted under statute and policy when lights and siren are used and due regard for public safety is maintained. It does not grant absolute immunity from liability.

An emergency response using lights and siren, authorized for calls involving imminent threat to life or serious property loss. Officers must still slow or stop when necessary to avoid danger.

Agency rules governing when and how officers may pursue fleeing vehicles or persons, including authorization, supervision, termination criteria, and restrictions based on offense severity and risk.

The written account of an incident in plain, chronological, first-person language, covering who, what, when, where, how, and why, with facts separated from conclusions and all elements of the offense addressed.

A portable device that analyzes heart rhythm and delivers an electric shock to a person in cardiac arrest. It is used with CPR as soon as available and prompts the user through each step.

Chest compressions, with rescue breaths or compression-only technique, that circulate oxygenated blood when the heart has stopped. High-quality compressions at the proper rate and depth are the priority.

The sequence of actions that improves outcomes in cardiac arrest: early recognition and activation of emergency response, early CPR, early defibrillation, advanced care, and post-arrest care.

The physical and psychological readiness required for police work, including cardiovascular conditioning, strength, sleep, nutrition, stress management, and peer support. It affects decision-making, safety, and career longevity.

The physical and emotional reaction that can follow a traumatic event such as a shooting, death notification, or child death. Symptoms may be delayed; peer support and early intervention help prevent lasting harm.