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Encyclopedia / Security, Defense & Protective Services

Law Enforcement and Policing

Specialty Knowledge entries in Law Enforcement and Policing.

District of Columbia police officers on patrol in downtown Washington, D.C.

Community Policing

Overview Community policing is a philosophy and strategy of law enforcement that emphasizes building sustained partnerships between police officers and the communities they serve. Rather than focusing narrowly on responding to individual crimes after they occur, community policing seeks to identify and address the underlying conditions that contribute to crime and disorder in a given

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Community policing is a strategy that emphasizes building collaborative relationships between police and the neighborhoods they serve to proactively identify and address the causes of crime and disorder.

Police department color guard at a National Night Out community crime prevention event

Crime Prevention

Overview Crime prevention refers to the broad range of strategies intended to reduce the likelihood that crime will occur in the first place, as opposed to responding to crimes after they have been committed. These strategies span multiple approaches, from altering the physical environment to addressing social and economic conditions associated with criminal behavior. Situational

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Crime prevention encompasses the strategies and programs aimed at reducing the occurrence of crime before it happens, rather than responding to crime after it has already taken place.

Military police practice fingerprint dusting techniques during a criminal investigation training course

Criminal Investigation

Overview Criminal investigation is the structured process law enforcement agencies use to determine whether a crime has been committed and, if so, to identify and build a case against the individuals responsible. It combines the systematic collection of physical evidence, the gathering of witness and victim statements, and increasingly the analysis of digital records and

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Criminal investigation is the systematic process of gathering, documenting, and analyzing evidence to determine whether a crime occurred and to identify the individuals responsible for it.

The FBI Academy at Quantico, Virginia, home of the Behavioral Analysis Unit

Criminal Profiling

Overview Criminal profiling is an investigative technique in which analysts examine evidence from a crime scene, along with information about the victim and the circumstances of the offense, to construct a description of the likely psychological and behavioral characteristics of an unknown perpetrator. It is most often applied to serious violent crimes, particularly serial offenses

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Criminal profiling is an investigative technique that uses behavioral and psychological analysis of crime scene evidence to develop a description of the likely characteristics of an unknown offender.

Investigators practice crime scene processing and fingerprint dusting during forensic science training

Forensic Science

Overview Forensic science applies methods from biology, chemistry, physics, and other scientific disciplines to questions arising in criminal and civil legal proceedings, most commonly the analysis of physical evidence collected from crime scenes. It plays a central role in modern criminal investigation, helping to establish facts such as the identity of a perpetrator, the cause

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Forensic science is the application of scientific methods and techniques to the investigation of crime, including the analysis of physical evidence such as DNA, fingerprints, and trace materials.

A military policeman handcuffs a suspect after making an arrest

Miranda Rights

Overview Miranda rights refer to a set of warnings that police officers in the United States are constitutionally required to give before questioning a suspect who is in custody, informing the individual of their right to remain silent, that anything they say can be used against them in court, and their right to have an

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Miranda rights are the set of warnings that police in the United States must give to a suspect in custody before conducting an interrogation, informing them of their right to remain silent and to have an attorney present.

A Minneapolis Police Department officer wears a body camera while responding to a call

Police Accountability

Overview Police accountability encompasses the range of mechanisms intended to ensure that officers and agencies exercise their authority lawfully and that misconduct, when it occurs, is identified and addressed. These mechanisms operate at multiple levels, from internal departmental review to external civilian oversight and the broader legal system. Internal mechanisms Most police departments maintain internal

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Police accountability refers to the systems, policies, and institutions designed to ensure that law enforcement officers and agencies act within the law and can be held responsible for misconduct.

Minneapolis traffic patrol car and officer, 1987

Police Patrol

Overview Police patrol refers to the continuous movement of officers through an assigned geographic area, whether on foot, in vehicles, or using other means such as bicycles or horses, with the goals of deterring crime, maintaining public order, and responding quickly to calls for service. Patrol remains the largest single function within most police departments

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Police patrol is the practice of officers moving through an assigned area on foot, in vehicles, or by other means to deter crime, respond to calls for service, and maintain visible police presence.

A Border Patrol agent inspects a vehicle for illegal substances at a checkpoint

Search and Seizure

Overview Search and seizure law governs the circumstances under which government officials, most commonly police, may examine a persons body, vehicle, home, or belongings and take possession of items found during that examination. In the United States, this area of law is rooted primarily in the Fourth Amendment to the Constitution, which protects against unreasonable

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Search and seizure refers to the legal rules governing when law enforcement officers may examine a person, vehicle, or property and take possession of evidence or contraband found during that examination.

Korean National Police in riot shield formation

Use of Force

Overview Use of force describes the physical, mechanical, or in some cases lethal means that law enforcement officers may lawfully apply in the course of their duties, including to make an arrest, restrain an individual, or protect themselves or others from harm. Because force by its nature carries risk of injury, its use is subject

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Use of force refers to the physical or mechanical compulsion that law enforcement officers are legally permitted to apply when necessary to control a situation, make an arrest, or protect themselves or others.