PA Act 120 MPOETC study materials
PA Act 120 MPOETC study resources

PA Act 120 MPOETC key terms

PA Act 120 MPOETC · Get comfortable with the vocabulary.

Probable Cause

Facts and circumstances that would lead a reasonable officer to believe a crime has been, is being, or will be committed, and that a particular person or place is connected to it.

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

Specific, articulable facts, not a mere hunch or instinct, that criminal activity may be occurring and that the person stopped is connected to it. It is the standard for an investigative detention.

Related: Investigative Detention (Terry Stop), Probable Cause
Arrest Warrant

A written order signed by a judge or magisterial district judge directing officers to take a named person into custody. It must be supported by probable cause and be properly served.

Related: Probable Cause, Search Warrant
Search Warrant

A court order, based on probable cause, authorizing officers to search a specific person, place, or vehicle for specific items. It must particularly describe the place to be searched and the things to be seized.

Related: Probable Cause, Exigent Circumstances, Consent Search
Exigent Circumstances

Urgent conditions such as hot pursuit, imminent destruction of evidence, or danger to life that make waiting for a warrant unreasonable and permit immediate police action.

Related: Search Warrant, Plain View Doctrine
Plain View Doctrine

Permission to seize items without a warrant when officers are lawfully present, the item is in open view, and its incriminating character is immediately apparent.

Related: Exigent Circumstances, Search Incident to Lawful Arrest
Consent Search

A warrantless search allowed when a person with authority over the place or property gives voluntary, unambiguous permission. That person may limit the scope of the search or withdraw consent at any time.

Related: Search Warrant, Plain View Doctrine
Search Incident to Lawful Arrest

A warrantless search of an arrestee's person and the area within immediate reach, justified by officer safety and the need to prevent destruction of evidence.

Related: Plain View Doctrine, Handcuffing and Control Holds
Miranda Warnings

Advisements required before custodial interrogation: the right to remain silent, that anything said can be used in court, the right to counsel, and appointed counsel for those who cannot afford one.

Related: Custodial Interrogation, Investigative Detention (Terry Stop)
Custodial Interrogation

Police questioning, or words or actions reasonably likely to elicit an incriminating response, that occurs after a person has been arrested or otherwise deprived of freedom in a significant way.

Related: Miranda Warnings, Investigative Detention (Terry Stop)
Investigative Detention (Terry Stop)

A brief seizure based on reasonable suspicion during which officers may identify the person, ask questions, and pat down outer clothing if they suspect the person is armed and dangerous.

Related: Reasonable Suspicion, Custodial Interrogation
Fruit of the Poisonous Tree

Evidence obtained through an unconstitutional search or seizure that is generally excluded from trial unless an exception, such as inevitable discovery or attenuation, applies.

Related: Search Warrant, Consent Search
Protection From Abuse (PFA) Order

A civil court order under Pennsylvania law directing an abuser to stay away from and have no contact with a family or household member; officers enforce the order and act on violations.

Related: Probable Cause, Arrest Warrant
Vehicle Pursuit

An active attempt by an officer driving a patrol vehicle to apprehend a fleeing suspect who is aware of the attempt and resisting apprehension by fleeing. It requires continuous risk assessment under department policy.

Related: High-Risk Traffic Stop, Radio Discipline
High-Risk Traffic Stop

A stop of a vehicle whose occupants are believed to be armed or dangerous, conducted with multiple units, cover, and felony-stop procedures instead of routine contact.

Related: Vehicle Pursuit, Handcuffing and Control Holds
Active Threat Response

The immediate response to an ongoing attack causing death or serious injury: officers move toward the threat, locate and stop the attacker, then render aid, without waiting for specialized units.

Related: Building Clearing, Deadly Force
Building Clearing

A coordinated, systematic movement through a structure to locate a suspect or victim, using cover, concealment, team communication, and controlled angles.

Related: Active Threat Response, Radio Discipline
Radio Discipline

Concise, standard transmissions using proper unit identification and clear speech so dispatch and other units can copy critical information correctly the first time.

Related: Vehicle Pursuit, Building Clearing
Chain of Custody

The documented, unbroken record of every person who handled an item of evidence, and when and why, from collection through court, showing that the item is authentic and unaltered.

Related: Evidence Packaging, Crime Scene Preservation
Crime Scene Preservation

Protecting a scene by setting a perimeter, controlling access, keeping an entry log, and preventing contamination so that evidence is documented in its original condition.

Related: Photographic Documentation, Chain of Custody
Evidence Packaging

Sealing each item in an appropriate container and labeling it with case number, item number, date, and collector to prevent loss, cross-contamination, or degradation.

Related: Chain of Custody, Crime Scene Preservation
Photographic Documentation

Recording a scene before anything is moved, using overall, mid-range, and close-up photographs with a scale, so the images accurately show the location and condition of evidence.

Related: Crime Scene Preservation, Evidence Packaging
Show-Up Identification

Presentation of a single detained suspect to a witness soon after a crime. It is inherently suggestive and is admissible only when necessary and not conducted in an unnecessarily suggestive way.

Related: Investigative Detention (Terry Stop), Incident Report
Incident Report

A factual written record of an officer's involvement in an event, in chronological order, including names, times, observations, and actions taken; it may later be used in court.

Related: Chain of Custody, Show-Up Identification
Objectively Reasonable Force

Force measured from the perspective of a reasonable officer on the scene, weighing the severity of the crime, the immediate threat, and whether the subject was resisting or fleeing.

Related: Use of Force Continuum, Deadly Force, De-escalation
Use of Force Continuum

A framework matching officer response levels, such as presence, verbal direction, control techniques, intermediate weapons, and deadly force, to the subject's behavior, allowing escalation or de-escalation.

Related: Objectively Reasonable Force, De-escalation
Deadly Force

Force that the officer knows or should know creates a substantial risk of death or serious bodily injury. It is justified only to prevent an imminent threat of death or serious injury to the officer or another person.

Related: Objectively Reasonable Force, Active Threat Response
De-escalation

Using time, distance, cover, containment, and communication to reduce the intensity of an encounter so that force is avoided or minimized when it is safe to do so.

Related: Use of Force Continuum, Objectively Reasonable Force
Handcuffing and Control Holds

Restraint and physical techniques used to gain and maintain lawful control of a resisting subject, applied with the minimum force needed and adjusted if the subject stops resisting.

Related: Search Incident to Lawful Arrest, Objectively Reasonable Force
Procedural Justice

Treating people with dignity and respect, giving them a voice, making neutral decisions, and communicating trustworthy motives, which encourages voluntary compliance with the law.

Related: Community Policing, Law Enforcement Code of Ethics
Bias-Based Profiling

Making enforcement decisions based on race, ethnicity, national origin, gender, religion, or sexual orientation rather than on behavior or reliable information about an individual.

Related: Procedural Justice, Law Enforcement Code of Ethics
Duty to Intervene

An officer's obligation to stop another officer's excessive force or clear misconduct when in a position to do so, and to report that conduct to a supervisor.

Related: Objectively Reasonable Force, Law Enforcement Code of Ethics
Community Policing

A strategy in which officers build ongoing partnerships with residents and organizations to identify problems and solve them together, rather than only responding to calls for service.

Related: Procedural Justice, Incident Report
Law Enforcement Code of Ethics

A statement of core values, including integrity, honesty, respect for constitutional rights, and service to the public, that sets the standard of conduct expected of officers on and off duty.

Related: Procedural Justice, Duty to Intervene
Physical Fitness Standards

The job-related fitness levels in areas such as aerobic capacity, strength, and flexibility that a police recruit must meet for certification and that officers are expected to maintain throughout their careers.

Related: Critical Incident Stress, Peer Support
Critical Incident Stress

Normal physical and emotional reactions, such as fatigue, intrusive thoughts, anger, or sleep problems, that can follow a traumatic event and are managed through peer support, debriefing, and professional care.

Related: Peer Support, Physical Fitness Standards
Peer Support

A support program in which trained officers confidentially help colleagues cope with job-related stress, trauma, or personal problems and connect them with professional resources.

Related: Critical Incident Stress, Law Enforcement Code of Ethics