MA POST key terms

A set of facts and circumstances that would lead a reasonable officer to believe a crime has been, is being, or is about to be committed, or that evidence will be found in a specific place.

A lower threshold than probable cause: specific, articulable facts plus rational inferences that criminal activity may be afoot, justifying a brief investigative stop.

A brief detention based on reasonable suspicion during which an officer may investigate suspected criminal activity without placing the person under formal arrest.

A limited pat-down of a person's outer clothing for weapons, permitted when the officer reasonably suspects the person is armed and dangerous, not a general search for evidence.

A judicial order authorizing officers to take a named person into custody, supported by sworn facts showing probable cause and generally required before entering a home to arrest.

A court order issued on probable cause that authorizes officers to search a specified place or person and seize described items, with limits on time and scope.

A written statement of facts sworn or affirmed under oath, commonly used to support a request for a search or arrest warrant and subject to challenge for omissions or misstatements.

The principle that evidence obtained through an unconstitutional search or seizure, and sometimes its derivative evidence, may be suppressed and kept out of the prosecution's case.

Evidence discovered through information obtained illegally is generally tainted and inadmissible, unless an exception such as independent source, attenuation, or inevitable discovery applies.

Advisements of the right to remain silent, that statements may be used against the person, the right to counsel, and appointed counsel for indigent defendants, required before custodial interrogation.

Questioning or its functional equivalent by police after a person has been formally arrested or deprived of freedom in a way that creates a comparable coercive pressure.

A knowing, voluntary, and intelligent relinquishment of the right to remain silent or to counsel, which the prosecution must prove and which the person may later revoke.

A narrow allowance to ask questions without Miranda warnings when needed to protect officers or the public from an immediate threat, such as locating a hidden firearm.

A strategy built on ongoing partnerships between officers and residents, joint problem solving, and organizational change so that police address the causes of local concerns, not just incidents.

An approach that scans for recurring problems, analyzes underlying causes, designs a tailored response, and assesses results, rather than repeatedly handling the same calls individually.

A four-step problem-solving cycle: scanning to identify problems, analysis of causes, response with tailored strategies, and assessment of whether the response worked.

The idea that people judge police legitimacy by how they are treated: whether they have voice, whether decisions are neutral and explained, and whether officers show dignity and trustworthy motive.

The public's belief that police authority is rightful and should be obeyed, which grows from fair treatment, transparent decision-making, and effective performance and supports voluntary cooperation.

A framework matching officer response options, from presence and verbal direction through control holds, intermediate weapons, and deadly force, to the threat perceived at that moment.

The constitutional standard judging force by what a reasonable officer on the scene would have done under the circumstances, without hindsight, considering the totality of the facts known.

The three core considerations for judging force: the severity of the crime at issue, whether the subject poses an immediate threat, and whether the subject is actively resisting or fleeing.

The full picture of facts and context known to the officer, including the subject's conduct, environment, information received, and rapidly changing events, weighed together rather than in isolation.

Force that the officer knows or should know creates a substantial risk of causing death or serious bodily injury; its use is tightly restricted by law and agency policy.

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

Techniques such as time, distance, cover, calm communication, and tactical repositioning that reduce the likelihood force will be needed while maintaining safety and control.

The documented, unbroken record of who collected, handled, transferred, and stored each item of evidence, used to show the item is authentic and unaltered.

The requirement that the original writing, recording, or photograph be produced to prove its contents, subject to recognized exceptions such as loss or unavailability.

An out-of-court statement offered to prove the truth of the matter asserted, generally inadmissible unless a recognized exception or exclusion applies.

A statement about a startling event made while the speaker was under the stress of that event, admissible as a hearsay exception because the stress reduces fabrication.

The prosecution's constitutional duty to disclose material exculpatory evidence to the defense, a duty that also reaches information known to investigating officers.

The obligation to reveal information that impeaches the credibility of a testifying officer, such as findings of dishonesty, so the defense can cross-examine effectively.

Specific, articulable facts indicating a civil motor vehicle violation or criminal activity justifies stopping a vehicle; the stop may not be extended beyond its original purpose without new justification.

A traffic stop justified by an observed violation but actually motivated by suspicion of other criminal activity; it remains valid if the violation objectively supports the stop.

Standardized divided-attention and balance exercises, such as horizontal gaze nystagmus, walk-and-turn, and one-leg stand, used with other observations to assess impairment.

A warrantless search permitted when a person with authority gives voluntary consent; the officer must show consent was freely given and may limit the search to the scope granted.

The core components of a clear narrative: who, what, when, where, why, and how, plus observations, actions taken, evidence, witnesses, and the officer's basis for each decision.

A documented account of the force used, the threat perceived, de-escalation attempted, injuries, witnesses, and notifications made, written to be accurate, complete, and reviewable.

A specialized response model pairing trained officers with mental health partners to safely connect people in behavioral health crisis to treatment rather than solely to the justice system.

A legal process allowing a person to be taken into protective custody and evaluated or hospitalized without consent when mental illness creates a likelihood of serious harm.

A disputed descriptive label for severe agitation, confusion, and hyperthermia sometimes seen in intense struggle; officers should treat it as a medical emergency and seek immediate EMS.

A standardized, scalable management structure that assigns command, operations, planning, logistics, and finance roles so multiple agencies can coordinate a response under one incident commander.

A command arrangement in which agencies with shared jurisdiction or responsibility jointly set objectives and strategy through one coordinated command structure at an incident.

A prearranged or requested sharing of personnel and resources between agencies during an emergency, governed by agreements and coordinated through the incident command structure.

The controlled boundary around an incident that keeps bystanders and traffic out, sets access routes for responders, and supports command, evidence protection, and force decisions.

During a lawful frisk, an officer may seize an object whose incriminating character is immediately apparent from touch, without manipulating or squeezing beyond what the frisk allows.

An officer lawfully present in a location may seize evidence of a crime that is immediately apparent, without a warrant, because the observation itself was not a search.

An exception to the exclusionary rule allowing illegally obtained evidence when the prosecution shows the same evidence would have been found through lawful means anyway.

An exception permitting evidence tainted by illegal police conduct when the same evidence was also obtained through a genuinely independent lawful source.

The Fourth Amendment rule that a warrant must describe with reasonable precision the place to be searched and the persons or things to be seized.

Urgent conditions, such as hot pursuit, imminent destruction of evidence, or danger to life, that can excuse the warrant requirement for entry or search.

Directing patrol and problem-solving resources to small geographic areas with concentrated crime, based on analysis showing crime clusters rather than spreading evenly.

A seizure of a person for a limited time and purpose, requiring reasonable suspicion, during which the person is not free to leave but is not formally arrested.

The contemporaneous written record of each item collected, its identifying number, description, location found, collector, and every transfer, supporting chain of custody at trial.