Policing Key Terms and Concepts

Vocabulary flashcards covering fundamental policing key terms, historical eras, constitutional principles, task force structures, and landmark court cases.

Metropolitan London Police

The first modern police force, established in England in 1829 by an act of parliament to reduce crime and riots, organized along military lines under civilian control at the national level in the Home Office.

Sir Robert Peel

The founder of the Metropolitan London Police who was instrumental in passing the legislation that created the first modern police force in 1829.

Metropolitan Police Act of 1829

The English legislation, spearheaded by Sir Robert Peel, that officially established the Metropolitan London Police.

Bobbies

An affectionate English term for London police officers, named after the founder of the Metropolitan London Police, Sir Robert Peel.

Crime Prevention

A series of related actions, often promoted by the police, that reduce individual or collective risk of crime victimization through target hardening, property marking, community organizing, and educational programs.

Target Hardening

The practice of making a potential target less susceptible to crime through the use of physical barriers, locks, alarm systems, video cameras, ID checks, or metal detectors.

Soft Target

A location, building, or facility with few or no security measures, allowing people to enter without being stopped, screened, or questioned.

Broken Windows Theory

An informal theory of police responsibility introduced in 1982 asserting that police should focus on controlling low-level order maintenance and quality-of-life offenses to prevent the occurrence of more serious felony crimes.

James Q. Wilson and George Kelling

The two social scientists who authored the 1982 Atlantic Monthly article introducing the Broken Windows theory.

Chain of Command

The organizational command and supervision structure in a police department representing the sequence through which orders are given and information is relayed.

CompStat

A data-driven management initiative instituted under NYPD Commissioner Bill Bratton in the 1990s that uses computer-generated crime statistics and mapping to track trends and hold precinct commanders accountable.

Bill Bratton

The NYPD Police Commissioner in the 1990s who introduced CompStat to reinvigorate command commitment to crime reduction.

Internal Affairs

A specialized investigative unit within a police department tasked with investigating complaints and criminal misconduct alleged against police officers.

Blue Wall of Silence

The informal practice where police officers refuse to report the misconduct or crimes of fellow officers, often driven by misguided solidarity or fear of social ostracism.

Kansas City Preventive Patrol Experiment

A 1972–1973 landmark study by the RAND Corporation testing police patrol effectiveness, concluding that random patrol produced random results and changing patrol levels had little impact on crime.

Minneapolis Hotspots of Crime Experiment

A study that validated targeted patrol by demonstrating that police presence should be concentrated on specific geographic hotspots where crime disproportionately occurs.

Multi-Jurisdictional Task Force

A composite law enforcement organization featuring personnel from local, state, and federal agencies working together on crimes that cross single agency boundaries, such as organized crime or drug networks.

Multi-Disciplinary Task Force

A specialized unit formed within a single large police department that pulls together detectives from different investigative specialties (e.g., burglary, special victims, robbery) to solve specific complex crime sprees.

Mutual Aid

Formal agreements between police or emergency agencies to assist one another across jurisdictional boundaries during times of need, providing law enforcement authority and legal protections to visiting officers.

Sting Operation

An anti-crime tactic where undercover police officers pose as criminals (such as drug dealers, fences, or prostitutes) to catch criminal actors and disrupt illegal markets.

Entrapment

An illegal practice in which police officers originate the idea and plant the seed in an individual's mind to commit a crime, rather than merely affording them the opportunity to commit it.

Use of Force

A general power exercised by police to gain compliance from a resisting citizen when non-physical measures like persuasion and direction fail.

Deadly Force

A category of police force involving firearms or high-impact weapon applications that can produce death or serious bodily injury.

Use of Force Continuum

A training guide mapping allowable police levels of force to the specific actions and resistance levels of a citizen.

Reasonable Force

The minimal amount of physical force necessary for a police officer to overcome a suspect's resistance.

Excessive Force

Any application of police force that is unreasonable or exceeds the minimal amount needed to overcome suspect resistance.

Racial Profiling

The unconstitutional practice of stopping or targeting individuals based on their race or ethnicity rather than objective reasonable suspicion or illegal behavior.

Fourteenth Amendment

The constitutional amendment guaranteeing equal protection under the law and due process, prohibiting discriminatory policing practices like racial profiling.

Consent Decree

A formal contract between the United States Department of Justice and a local law enforcement agency establishing timetables and corrective measures to eliminate unlawful police practices.

Zero Tolerance

An informal policing policy requiring strict enforcement and mandatory arrests for all low-level offenses without exception, eliminating officer discretion.

Discretion

The legal authority granted to criminal justice actors (police, prosecutors, judges, corrections) to make decisions within the law regarding how to handle low-level offenses or individual cases.

Patronage System

A corrupt system of city government in the 1800s and early 1900s where municipal job appointments, including police roles, were awarded by political patrons in exchange for loyalty or bribes.

Political Era

The era of American policing (1840s to 1930s) marked by political patronage, widespread corruption, an absence of formal training, and little focus on crime control.

Professional Era

The era of American policing (1930s to 1970s), also called the Reform Era, which sought to remove political influence, mandate police academy training, and introduce civil service exams.

Community Policing Era

The era of American policing beginning in the 1980s that balances crime control with forging community partnerships to jointly solve local problems.

Post-9/11 Era

The modern era of American policing following September 11, 2001, which required police agencies to incorporate anti-terrorism activities, intelligence gathering, and disaster response into their duties.

Exclusionary Rule

A constitutional principle mandating that evidence obtained illegally in violation of the Fourth Amendment cannot be admitted at a criminal trial.

Weeks v. United States

The 1914 Supreme Court decision that established the Exclusionary Rule for federal law enforcement and federal prosecutions.

Mapp v. Ohio

The landmark 1961 Supreme Court decision that extended the Exclusionary Rule to state and local police departments across the nation.