Police Sergeant Exam study materials
Police Sergeant Exam study resources

Police Sergeant Exam key terms

Police Sergeant Exam · Get comfortable with the vocabulary.

Span of control

The number of subordinates one supervisor can effectively direct. Narrow spans suit complex or hazardous work; wide spans suit routine, well-trained units. Supervisors adjust it as incident complexity grows.

Related: Unity of command, Incident Command System
Unity of command

The principle that each employee reports to only one supervisor at a time. It prevents conflicting orders and confusion during fast-moving events, and is a core reason for formal span-of-control limits.

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

The formal line of authority running from the chief down through each rank. Members normally communicate through it, and supervisors must not bypass it except in emergencies or when a policy exception applies.

Related: Unity of command, Incident Command System
Progressive discipline

A graduated response to misconduct that starts with counseling or oral reprimand and escalates to written reprimand, suspension, demotion, or termination. It assumes discipline is corrective, not merely punitive, and requires documented prior notice.

Related: Just cause, Weingarten rights
Just cause

The standard requiring an employer to show a fair, reasonable, and well-documented basis for discipline. It examines notice, consistency, investigation quality, and proportionality, and is often defined by contract or civil service rules.

Related: Progressive discipline, Garrity protection
Garrity protection

A rule limiting use of compelled statements in later criminal proceedings against the officer who made them. Supervisors may order answers for administrative purposes, but must warn that the statements cannot be used criminally.

Related: Just cause, Internal affairs investigation
Weingarten rights

A union-represented employee's right to have a representative present during an investigatory interview that the employee reasonably believes may lead to discipline. The employee must request representation; the employer may then choose to stop the interview.

Related: Progressive discipline, Internal affairs investigation
Internal affairs investigation

A formal administrative inquiry into alleged misconduct by department members. It gathers facts, determines whether policy was violated, and recommends findings, using standards different from a criminal case.

Related: Garrity protection, Weingarten rights
Situational leadership

A model in which a supervisor matches directive and supportive behavior to a subordinate's competence and commitment on a specific task. It moves from directing to coaching to supporting to delegating as readiness grows.

Related: Transformational leadership, Span of control
Transformational leadership

Leading by inspiring shared purpose, modeling values, and developing people beyond immediate tasks. It contrasts with transactional leadership, which relies on rewards, sanctions, and formal authority to gain compliance.

Related: Situational leadership, Servant leadership
Servant leadership

A philosophy in which the leader prioritizes the growth, safety, and needs of subordinates and the community. It emphasizes listening, stewardship, and removing obstacles rather than asserting rank.

Related: Transformational leadership, Procedural justice
Probable cause

Facts and circumstances that would lead a reasonable officer to believe a crime has been, is being, or will be committed, or that evidence will be found in a place. It is more than suspicion but less than certainty.

Related: Reasonable suspicion, Arrest warrant
Reasonable suspicion

Specific, articulable facts suggesting criminal activity, justifying a brief investigative detention. It is a lower standard than probable cause and must rest on observed behavior, not a hunch.

Related: Terry stop, Probable cause
Terry stop

A brief detention based on reasonable suspicion during which an officer may investigate and, if warranted by safety concerns, pat down outer clothing for weapons. It is limited in scope and duration.

Related: Reasonable suspicion, Exclusionary rule
Exclusionary rule

The principle that evidence obtained through an unconstitutional search or seizure is generally inadmissible in court. Exceptions include good faith, inevitable discovery, and attenuation.

Related: Search warrant, Miranda warning
Search warrant

A court order authorizing a search of a specific place for specific items, based on probable cause. It must be executed within the time allowed and limited to the place and items described.

Related: Probable cause, Exclusionary rule
Miranda warning

The advisement of rights required before custodial interrogation: silence, counsel, and appointed counsel. Custody plus interrogation triggers it; spontaneous statements or routine booking questions generally do not.

Related: Custodial interrogation, Exclusionary rule
Custodial interrogation

Questioning by police after a person has been taken into custody or otherwise deprived of freedom in a significant way. It triggers the Miranda requirement and demands careful documentation of time, place, and words used.

Related: Miranda warning
Arrest warrant

A judicial order authorizing seizure of a person based on probable cause. Officers must confirm its validity and scope, and generally may not enter a third party's home to execute it without consent or exigency.

Related: Probable cause, Exigent circumstances
Exigent circumstances

Urgent conditions, such as imminent danger to life, hot pursuit, or likely destruction of evidence, that justify warrantless action. The government bears the burden of showing the urgency was real.

Related: Arrest warrant, Search warrant
Hot pursuit

A warrantless entry justified by an officer closely chasing a suspect who flees from a lawful arrest. The pursuit must be continuous and the underlying offense must support arrest.

Related: Exigent circumstances
Brady material

Evidence favorable to the accused that is material to guilt or punishment and must be disclosed by the prosecution. Officers must preserve and forward such information, including credibility issues, to prosecutors.

Related: Chain of custody, Discovery
Chain of custody

The documented, unbroken record of who handled evidence, when, and for what purpose. Gaps or unclear entries can undermine admissibility and are a common target of defense challenges.

Related: Brady material, Evidence log
Evidence log

A record listing each item seized or received, with description, location found, collector, date, and storage location. It supports the chain of custody and is reviewed before testimony.

Related: Chain of custody
Discovery

The pretrial process in which parties exchange information about witnesses, evidence, and defenses. Officers support it by producing complete reports and disclosing favorable information to the prosecutor.

Related: Brady material, Report writing
Report writing

Documenting events in clear, factual, chronological language that supports later review, prosecution, and training. Good reports separate observation from inference and include who, what, when, where, why, and how.

Related: Discovery, Use-of-force report
Use-of-force report

A written account of force used, including the officer's perception of threat, the options considered, and the outcome. It must be factual, timely, and consistent with policy and any recorded evidence.

Related: Force continuum, Report writing
Force continuum

A framework describing levels of resistance and corresponding force options, from presence and verbal direction to physical control and deadly force. It guides proportionality and is often paired with a reasonableness standard.

Related: Use-of-force report, De-escalation
De-escalation

Techniques such as time, distance, cover, communication, and slowing the pace that reduce the need for force. Policy often requires using them when feasible before escalating.

Related: Force continuum, Crisis intervention team
Crisis intervention team

A trained group of officers who respond to people in behavioral health crisis, using specialized communication and community referral. Supervisors should request CIT or co-response when available.

Related: De-escalation
Problem-oriented policing

An approach that identifies underlying conditions behind repeat incidents and designs tailored responses, commonly via the SARA model of scanning, analysis, response, and assessment. It measures outcomes, not just activity.

Related: SARA model, Community policing
SARA model

A four-step problem-solving process: scanning to identify problems, analysis of causes, response through tailored strategies, and assessment of results. It structures problem-oriented projects and their documentation.

Related: Problem-oriented policing
Community policing

A philosophy of partnership between police and residents to identify and solve local problems, supported by communication, transparency, and decentralized decision making. It is a strategy, not a single program.

Related: Problem-oriented policing, Procedural justice
Procedural justice

The idea that people accept decisions more readily when the process is fair: voice, neutrality, respectful treatment, and trustworthy motives. Supervisors model it internally as well as in public contacts.

Related: Community policing, Servant leadership
Incident Command System

A standardized, scalable structure for managing emergencies, with common terminology, clear objectives, and defined roles such as command, operations, planning, logistics, and finance. It integrates multiple agencies under one plan.

Related: Unified command, Span of control
Unified command

An incident structure in which agencies with jurisdiction or responsibility share command decisions through one coordinated set of objectives. It avoids competing commands at multi-agency scenes.

Related: Incident Command System
After-action review

A structured debrief after an incident or exercise that examines what was planned, what happened, why, and what should change. Findings feed training, policy revision, and future planning.

Related: Incident Command System
Mutual aid agreement

A written arrangement under which agencies provide personnel, equipment, or services to one another during emergencies. It defines authority, cost, liability, and how responding resources integrate into command.

Related: Unified command
Early intervention system

A data-based tool that flags officers showing patterns such as repeated force, complaints, or sick leave, prompting supervisory review and support. It is non-disciplinary and aims to correct problems early.

Related: Internal affairs investigation, Progressive discipline