Law enforcement agency
A government-authorized organization that prevents crime, investigates offenses, maintains public order, or enforces laws.
Police: A public institution responsible for maintaining order, preventing crime, and enforcing laws. Police are the most familiar form of law enforcement agency, though the category also includes specialized bodies.
Police power: The authority of a state to regulate conduct and protect public health, safety, and welfare. This governing authority underlies many domestic law-enforcement responsibilities.
Federal Bureau of Investigation: A United States federal agency that investigates federal crimes and conducts domestic intelligence work. The FBI illustrates a national agency with broad investigative responsibilities.
Private security: Non-governmental services that protect people, property, or information for clients. Private security may deter or report offenses but generally lacks an agency’s public legal authority.
Criminal investigation: The systematic gathering and analysis of evidence about suspected crimes. Investigative units build cases by identifying suspects, reconstructing events, and documenting evidence.
Jurisdiction: The legal authority of a court or government body to act over people, places, or matters. Jurisdiction sets the geographic and subject-matter limits of an agency’s authority.
Drug Enforcement Administration: A United States federal agency responsible for enforcing controlled-substance laws. The DEA shows how an agency can focus on a defined area of criminal enforcement.
Prosecutor: A public lawyer who brings criminal charges and presents the government’s case in court. Prosecutors decide whether to pursue cases; agencies investigate and enforce laws.
Patrol: The organized movement of officers through an area to observe conditions and respond to incidents. Patrol places agency personnel in public spaces to deter offenses and answer calls.
Criminal law: The body of law defining offenses and prescribing penalties and procedures for prosecution. Agencies enforce criminal prohibitions but do not themselves determine guilt or impose sentences.