Law enforcement is the activity of some members of the government or other social institutions who act in an organized manner to enforce the law by investigating, deterring, rehabilitating, or punishing people who violate the rules and norms governing that society. [1] The term encompasses police, courts and corrections. These three components of the criminal justice system may operate independently of each other or collectively through the use of record sharing and cooperation. Throughout the world, law enforcement are also associated with protecting the public, life, property, and keeping the peace in society. [2]
The concept of law enforcement dates back to ancient times, and forms of law enforcement and police have existed in various forms across many human societies. Modern state legal codes use the term law enforcement officer or peace officer to include every person vested by the legislating state with police power or authority; traditionally, anyone sworn or badged who can arrest any person for a violation of criminal law is included under the umbrella term of law enforcement.
Although law enforcement may be most concerned with the prevention and punishment of crimes, organizations exist to discourage a wide variety of non-criminal violations of rules and norms, effected through the imposition of less severe consequences such as probation.
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Law enforcement organizations existed in ancient times, such as prefects in ancient China, paqūdus in Babylonia, curaca in the Inca Empire, vigiles in the Roman Empire, and Medjay in ancient Egypt. Who law enforcers were and reported to depended on the civilization and often changed over time, but they were typically enslaved people, soldiers, officers of a judge, or hired by settlements and households. Aside from their duties to enforce laws, many ancient law enforcers also served as slave catchers, firefighters, watchmen, city guards, and bodyguards.
By the post-classical period and the Middle Ages, forces such as the Santa Hermandades, the shurta, and the Maréchaussée provided services ranging from law enforcement and personal protection to customs enforcement and waste collection. In England, a complex law enforcement system emerged, where tithings, groups of ten families, were responsible for ensuring good behavior and apprehending criminals; groups of ten tithings ("hundreds") were overseen by a reeve; hundreds were governed by administrative divisions known as shires; and shires were overseen by shire-reeves. In feudal Japan, samurai were responsible for enforcing laws.
The concept of police as the primary law enforcement organization originated in Europe in the early modern period; the first statutory police force was the High Constables of Edinburgh in 1611, while the first organized police force was the Paris lieutenant général de police in 1667. Until the 18th century, law enforcement in England was mostly the responsibility of private citizens and thief-takers, albeit also including constables and watchmen. This system gradually shifted to government control following the 1749 establishment of the London Bow Street Runners, the first formal police force in Britain. In 1800, Napoleon reorganized French law enforcement to form the Paris Police Prefecture; the British government passed the Glasgow Police Act, establishing the City of Glasgow Police; and the Thames River Police was formed in England to combat theft on the River Thames. In September 1829, Robert Peel merged the Bow Street Runners and the Thames River Police to form the Metropolitan Police. The title of the "first modern police force" has still been claimed by the modern successors to these organizations. [3] [4]
Following European colonization of the Americas, the first law enforcement agencies in the Thirteen Colonies were the New York Sheriff's Office and the Albany County Sheriff's Department, both formed in the 1660s in the Province of New York. The Province of Carolina established slave-catcher patrols in the 1700s, and by 1785, the Charleston Guard and Watch was reported to have the duties and organization of a modern police force. The first municipal police department in the United States was the Philadelphia Police Department, while the first American state police, federal law enforcement agency was the United States Marshals Service, both formed in 1789. In the American frontier, law enforcement was the responsibility of county sheriffs, rangers, constables, and marshals. The first law enforcement agency in Canada was the Royal Newfoundland Constabulary, established in 1729, while the first Canadian national law enforcement agency was the Dominion Police, established in 1868.
By the 19th century, improvements in technology, greater global connections, and changes in the sociopolitical order led to the establishment of police forces worldwide. National, regional, and municipal civilian law enforcement agencies exist in practically all countries; to promote their international cooperation, the International Criminal Police Organization, also known as Interpol, was formed in September 1923. Technology has made an immense impact on law enforcement, leading to the development and regular use of police cars, police radio systems, police aviation, police tactical units, and police body cameras.
Most law enforcement is conducted by some law enforcement agency, typically a police force. Civilians generally staff police agencies, which are typically not a military branch. However, some militaries do have branches that enforce laws among the civilian populace, often called gendarmerie, security forces, or internal troops. Social investment in enforcement through such organizations can be massive in terms of the resources invested in the activity and the number of people professionally engaged to perform those functions. [5]
Law enforcement agencies are limited to operating within a specified jurisdiction. These are typically organized into three basic levels: national, regional, and municipal. However, depending on certain factors, there may be more or less levels, or they may be merged: in the United States, there are federal, state, and local police and sheriff agencies; in Canada, some territories may only have national-level law enforcement, while some provinces have national, provincial, and municipal; in Japan, there is a national police agency, which supervises the police agencies for each individual prefecture; and in Niger, there is a national police for urban areas and a gendarmerie for rural areas, both technically national-level. In some cases, there may be multiple agencies at the same level but with different focuses: for example, in the United States, the Drug Enforcement Administration and the Bureau of Alcohol, Tobacco, Firearms and Explosives are both national-level federal law enforcement agencies, but the DEA focuses on narcotics crimes, while the ATF focuses on weapon regulation violations.
Various segments of society may have their own specialist law enforcement agency, such as the military having military police, schools having school police or campus police, or airports having airport police. Private police may exist in some jurisdictions, often to provide dedicated law enforcement for privately-owned property or infrastructure, such as railroad police for private railways or hospital police for privately-owned hospital campuses.
Depending on various factors, such as whether an agency is autonomous or dependent on other organizations for its operations, the governing body that funds and oversees the agency may decide to dissolve or consolidate its operations. Dissolution of an agency may occur when the governing body or the agent itself decides to end operations. This can occur due to multiple reasons, including criminal justice reform, [6] a lack of population in the jurisdiction, mass resignations, [7] efforts to deter corruption, or the governing body contracting with a different agency that renders the original agency redundant or obsolete. According to the International Association of Chiefs of Police, agency consolidation can occur to improve efficiency, consolidate resources, or when forming a new type of government. [8]
The police are a constituted body of persons empowered by a state with the aim of enforcing the law and protecting the public order as well as the public itself. This commonly includes ensuring the safety, health, and possessions of citizens, and to prevent crime and civil disorder. Their lawful powers encompass arrest and the use of force legitimized by the state via the monopoly on violence. The term is most commonly associated with the police forces of a sovereign state that are authorized to exercise the police power of that state within a defined legal or territorial area of responsibility. Police forces are often defined as being separate from the military and other organizations involved in the defense of the state against foreign aggressors; however, gendarmerie are military units charged with civil policing. Police forces are usually public sector services, funded through taxes.
Marshal is a term used in several official titles in various branches of society. As marshals became trusted members of the courts of Medieval Europe, the title grew in reputation. During the last few centuries, it has been used for elevated offices, such as in military rank and civilian law enforcement.
Security police usually describes a law enforcement agency which focuses primarily on providing security and law enforcement services to particular areas or specific properties. They may be employed by governmental, public, or private institutions. Security police are generally considered distinct from security guards as security police personnel typically hold some level of law enforcement authority. The exact powers held by security police vary widely between jurisdictions. Examples of these types of agencies include the United States' DoD Police and FBI Police, the Indian Central Industrial Security Force, and the British Civil Nuclear Constabulary.
Special police usually describes a police force or unit within a such an agency whose duties and responsibilities are significantly different from other forces in the same country or from other personnel within the same agency, although there is no consistent international definition. Generally, special police personnel hold some level of police powers; sometimes they hold the same powers and authority of other law enforcement officers within their jurisdiction, but at a minimum they will typically possess detainment and arrest authority. 'Special police' is also occasionally used when referring to an 'elite' law enforcement agency or unit, such as special weapons and tactics (SWAT) units or other similar paramilitary forces who have some level of police power. 'Special police' may also be used to describe individuals who are granted police powers incidental to their primary duties, such as welfare fraud investigators, certain security guards, child welfare investigators, and agricultural inspectors. Special police personnel may be armed or unarmed.
Inspector, also police inspector or inspector of police, is a police rank. The rank or position varies in seniority depending on the organization that uses it.
Public security or public safety is the prevention of and protection from events that could endanger the safety and security of the public from significant danger, injury, or property damage. It is often conducted by a state government to ensure the protection of citizens, persons in their territory, organizations, and institutions against threats to their well-being, survival, and prosperity.
Throughout the history of criminal justice, evolving forms of punishment, added rights for offenders and victims, and policing reforms have reflected changing customs, political ideals, and economic conditions.
As of 2024, more than 1,280,000 sworn law enforcement officers are serving in the United States. About 137,000 of those officers work for federal law enforcement agencies.
Law enforcement in Canada is the responsibility of police services, special constabularies, and civil law enforcement agencies, which are operated by every level of government, some private and Crown corporations, and First Nations. In contrast to the United States or Mexico, and with the exception of the Unité permanente anticorruption in Quebec and the Organized Crime Agency of British Columbia, there are no organizations dedicated exclusively to the investigation of criminal activity in Canada. Criminal investigations are instead conducted by police services, which maintain specialized criminal investigation units in addition to their mandate for emergency response and general community safety.
Law enforcement in Albania is the responsibility of several agencies. The responsibility for most tasks lies with the Albanian State Police, a national police agency, which is under the authority of Ministry of Internal Affairs. Examples of other agencies with limited policing powers are the Municipal Police, which has administrative functions and operates in the local level. They are controlled by mayors.
Private police or special police are types of law enforcement agencies owned and/or controlled by non-government entities. Additionally, the term can refer to an off-duty police officer while working for a private entity, providing security, or otherwise performing law enforcement-related services. Officers engaging in private police work have the power to enforce the law. However, the specific authority they have, and the terms used for it, vary from one place to another.
Sheriffs In the United States are the chief of law enforcement officers of a county. Sheriffs are usually either elected by the populace or appointed by an elected body.
In many countries, particularly those with a federal system of government, there may be several law enforcement agencies, police or police-like organizations, each serving different levels of government and enforcing different subsets of the applicable law.
The following outline is provided as an overview of and introduction to law enforcement:
Mexico law enforcement is distributed among three distinct powers of authority and jurisdiction: federal, state, and municipal. With the reform of former President Andres Manuel Lopez Obrador of Mexico’s Federal Police, the agency was replaced with the new National Guard, which serves as a federal ‘military police.’ The main goal of the National Guard is to bring justice and peace to the country. The National Guard was created because some sections of the Federal Police were involved in organized crime, corruption, and similar issues.
The Alberta Sheriffs Branch is a provincial law enforcement agency overseen by the Ministry of Public Safety and Emergency Services of the province of Alberta, Canada. Under the authority of the Peace Officer Act, Alberta Sheriffs are provincial peace officers with jurisdiction over the province of Alberta. The premier of Alberta has the authority to grant emergency police powers to all Alberta sheriffs during major emergencies within the province. The Alberta Sheriffs Branch is the largest sheriff service in Canada.
A special constable or special police constable can refer to an auxiliary or part-time law enforcement officer or a person who is granted certain (special) police powers.
A law enforcement agency (LEA) is any government agency responsible for law enforcement within a specific jurisdiction through the employment and deployment of law enforcement officers and their resources. The most common type of law enforcement agency is the police, but various other forms exist as well, including agencies that focus on specific legal violation, or are organized and overseen by certain authorities. They typically have various powers and legal rights to allow them to perform their duties, such as the power of arrest and the use of force.
In the United States, there is no consistent use of the office of constable throughout the states; use may vary within a state. A constable may be an official responsible for service of process: such as summonses and subpoenas for people to appear in court in criminal and/or civil matters. They can also be fully empowered law enforcement officers. Constables may have additional specialized duties unique to the office. In some states the constable is an elected or appointed position at the state or local level of local government. Their jurisdiction can vary from statewide to county/parish and local township boundaries based on the state's laws.