Law enforcement in the United States

Law enforcement
in the United States
Separation of powers
Law enforcement agencies
Types of agency
Types of agent

Law enforcement in the United States is one of three major components of the criminal justice system of the United States, along with courts and corrections. Although each component operates semi-independently, the three collectively form a chain leading from an investigation of suspected criminal activity to the administration of criminal punishment.

Law enforcement operates primarily through governmental police agencies. There are 17,985 U.S. police agencies in the United States which include County Sheriff, City and State Police Departments, and Federal Law Enforcement Agencies. The law-enforcement purposes of these agencies are the investigation of suspected criminal activity, referral of the results of investigations to the courts, and the temporary detention of suspected criminals pending judicial action. Law enforcement agencies, to varying degrees at different levels of government and in different agencies, are also commonly charged with the responsibilities of deterring criminal activity and preventing the successful commission of crimes in progress. Other duties may include the service and enforcement of warrants, writs, and other orders of the courts.

Law enforcement agencies are also involved in providing first response to emergencies and other threats to public safety; the protection of certain public facilities and infrastructure; the maintenance of public order; the protection of public officials; and the operation of some correctional facilities (usually at the local level).

Types of police[edit]

Policing in the United States is conducted by "close to 18,000 federal, state, local and city departments, all with their own rules".[1] Every state has its own nomenclature for agencies, and their powers, responsibilities and funding vary from state to state.[1]


U.S. Park Police officers standing by during the 2005 Inauguration Day

At the federal level, there exists both federal police, who possess full federal authority as given to them under United States Code (U.S.C.), and federal law enforcement agencies, who are authorized to enforce various laws at the federal level. Both police and law enforcement agencies operate at the highest level and are endowed with police roles; each may maintain a small component of the other (for example, the FBI Police). The agencies have nationwide jurisdiction for enforcement of federal law. Most federal agencies are limited by the U.S. Code to investigating only matters that are explicitly within the power of the federal government. However, federal investigative powers have become very broad in practice, especially since the passage of the USA PATRIOT Act. There are also federal law enforcement agencies, such as the United States Park Police, that are granted state arrest authority off primary federal jurisdiction.

The Department of Justice (DOJ) is responsible for most law enforcement duties at the federal level.[2] It includes the Federal Bureau of Investigation (FBI), the Drug Enforcement Administration (DEA), the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF), the United States Marshals Service, the Federal Bureau of Prisons (BOP) and others.[3]

The Department of Homeland Security (DHS) is another branch with numerous federal law enforcement agencies reporting to it. U.S. Customs and Border Protection (CBP), U.S. Immigration and Customs Enforcement (ICE), United States Secret Service (USSS), United States Coast Guard (USCG), and the Transportation Security Administration (TSA) are some of the agencies that report to DHS.[4] The United States Coast Guard is assigned to the United States Department of Defense in the event of war.

At a crime or disaster scene affecting large numbers of people, multiple jurisdictions, or broad geographic areas, many police agencies may be involved by mutual aid agreements.[5] For example, the United States Federal Protective Service responded to the Hurricane Katrina natural disaster. The command in such situations remains a complex and flexible issue.

In accordance with the federal structure of the United States government, the national (federal) government is not authorized to execute general police powers by the Constitution of the United States of America. The power to have a police force is given to each of the United States' 50 federated states. The US Constitution gives the federal government the power to deal with foreign affairs and interstate affairs (affairs between the states). For police, this means that if a non-federal crime is committed in a US state and the fugitive does not flee the state, the federal government has no jurisdiction. However, once the fugitive crosses a state line he violates the federal law of interstate flight and is subject to federal jurisdiction, at which time federal law enforcement agencies may become involved.


Massachusetts State Police Troopers

Most states operate statewide government agencies that provide law enforcement duties, including investigations and state patrols. They may be called state police or highway patrol, and are normally part of the state Department of Public Safety. In addition, the Attorney General's office of each state has its own state bureau of investigation such as in California with the California Department of Justice. In Texas, the Texas Ranger Division fulfill this role though they have their history in the period before Texas became a state.

Various departments of state governments may have their own enforcement divisions, such as capitol police, campus police, state hospitals, Departments of Correction, water police, environmental (fish and game/wildlife) game wardens or conservation officers (who have full police powers and statewide jurisdiction). In Colorado, for instance, the Department of Revenue has its own investigative branch, as do many of the state-funded universities.


Also known as parishes and boroughs, county law enforcement is provided by sheriffs' departments or offices and county police.

County police[edit]

County police tend to exist only in metropolitan counties and have countywide jurisdiction. For places that have both county police and county sheriff, responsibilities are given to each. The county police are in charge of typical police duties such as patrol and investigations.[6] Whereas the sheriffs' department in this situation takes care of serving papers and providing security to the courts. County police tend to fall into three broad categories, full service, limited service, and restrictive service.[6] Full service provides full police services to the entire county. Limited service provides to the unincorporated and special districts. Restricted service provide security to the county-owned parts of the county.[6]

Commonwealth of Virginia[edit]

The Commonwealth of Virginia does not have overlapping County and City jurisdictions, whereas in the other 49 states most municipalities fall within (and share jurisdiction and many other governmental responsibilities with) a County. In Virginia, governmental power flows down from the State (or in Virginia's case, Commonwealth) directly to either a County or an Independent City. Thus, policing in Virginia is more streamlined: the County Sheriff's Office/Department or County Police Department does not overlap with an Independent City Police Department. Unincorporated Townships remain part of their parent County but may have Town Police Departments to augment their County law enforcement. Town Police Departments are often small and may deploy a combination of paid and nonpaid, full and part-time law enforcement officers, including auxiliary officers who typically serve as part-time, unpaid volunteers. If present, Independent City Sheriff's Offices usually follow the Restrictive model shown below for Sheriff's Departments, with limited law enforcement authority including warrant service, jail bailiff, etc. Mutual assistance compacts may exist where neighboring law enforcement agencies will assist each other, however, in addition to State (Commonwealth) law enforcement resources. Like most states, Virginia also has campus police officers. Under Virginia State, Code 23.1-809 and 23.1-810 public and private colleges and universities can maintain their own armed police force and employ sworn campus police officers. These sworn officers have the same authority as local police and are required to complete police academy training mandated by the Virginia Department of Criminal Justice Services. Virginia campus police officers have jurisdiction on and immediately around the campus, however, police departments may petition to the local circuit court for concurrent jurisdiction with the local police.[7][8]

Sheriffs' offices[edit]

Sheriffs are not police and have many different responsibilities. Sheriffs are elected officials where the head of police is appointed or hired in. Sheriffs are responsible for all three parts of the criminal justice system. They uphold the county jail, ensure safety within the courts, and have jurisdiction to enforce laws in the entire county.[9] They have more responsibilities such as transporting prisoners, running crime labs, and collecting taxes.[9]

  • In Texas, the sheriff's office is normally the agency responsible for handling mental health calls. If the situation is dangerous, a sheriff's deputy has the power to take a person to a hospital on a mental health commitment immediately. However, if the situation is not actively dangerous, a warrant must be sought. With the rise in mental health units across the state, the Texas CIT Association was formed.


Municipal police range from one-officer agencies (sometimes still called the town marshal) to the 40,000 person-strong New York City Police Department. Most municipal agencies take the form (Municipality Name) Police Department. Most municipalities have their own police departments.

Metropolitan departments, such as the Las Vegas Metropolitan Police Department, have jurisdiction covering multiple communities and municipalities, often over a wide area typically share geographical boundaries within one or more cities or counties. Metropolitan departments have usually been formed by a merger between local agencies, typically several local police departments and often the local sheriff's department or office, in efforts to provide greater efficiency by centralizing command and resources and to resolve jurisdictional problems, often in communities experiencing rapid population growth and urban sprawl, or in neighboring communities too small to afford individual police departments. Some county sheriff's departments, such as the Los Angeles County Sheriff's Department, are contracted to provide full police services to local cities within their counties.


There are other types of specialist police departments with varying jurisdictions. Most of these serve special-purpose districts and are known as special district police. In some states, they serve as little more than security police, but in states such as California, special district forces are composed of fully sworn peace officers with statewide authority.

These agencies can be transit police, school district police, campus police, airport police, railroad police, park police or police departments responsible for protecting government property, such as the former Los Angeles General Services Police. Some agencies, such as the Port Authority of New York and New Jersey Police Department, have multi-state powers. There are also some Private Police agencies, such as the Parkchester Department of Public Safety and Co-op City Department of Public Safety.

Puerto Rico Police[edit]

The Puerto Rico Police traces back to 1837, when Spanish governor Francisco Javier de Moreda y Prieto created La Guardia Civil de Puerto Rico (Puerto Rico Civil Guard) to protect the lives and property of Puerto Ricans who at the time were Spanish subjects, and provide police services to the entire island, even though many municipalities maintain their own police force. The United States invaded and took possession of Puerto Rico in July 1898 as a result of the Spanish–American War and has controlled the island as a US territory since then. The Insular Police of Puerto Rico was created on February 21, 1899, under the command of Col. Frank Thacher (US Marine officer during the Spanish–American War), with an authorized strength of 313 sworn officers. As of 2009, the PRPD had over 17,292 officers.

Police functions[edit]

A Florida Highway Patrol state trooper at the scene of a motor vehicle accident
FBI Evidence Response Team

Textbooks and scholars have identified three primary police agency functions. The following is cited from The American System of Criminal Justice, by George F. Cole and Christopher E. Smith, 2004, 10th edition, Wadsworth/Thomson Learning:

  • Order maintenance. This is the broad mandate to keep the peace or otherwise prevent behaviors which might disturb others. This can deal with things ranging from a barking dog to a fist-fight. By way of description, Cole and Smith note that police are usually called-on to "handle" these situations with discretion, rather than deal with them as strict violations of law, though of course their authority to deal with these situations are based in violations of law.
  • Law enforcement. Those powers are typically used only in cases where the law has been violated and a suspect must be identified and apprehended. Most obvious instances include robbery, murder, or burglary. This is the popular notion of the main police function, but the frequency of such activity is dependent on geography and season.
  • Service. Services may include rendering first aid, providing tourist information, guiding the disoriented, or acting as educators (on topics such as preventing drug use). Cole and Smith cited one study which showed 80% of all calls for police assistance did not involve crimes, but this may not be the case in all parts of the country. Because police agencies are traditionally available year-round, 24 hours a day, citizens call upon police departments not only in times of trouble but also when just inconvenienced. As a result, police services may include roadside auto assistance, providing referrals to other agencies, finding lost pets or property, or checking locks on vacationers' homes.


Early policing in American history was based on the ancient English common law system which relied heavily on citizen volunteers, watch groups, and a conscription system known as posse comitatus similar to the militia system, which continued until the mid-Nineteenth century.[10]

Police reform[edit]

There have been many initiatives to reform policing, notably since the 1960s, under President Lyndon Johnson, and several more recent efforts. Reforms based on community dialogue, legal requirements and updating of police training is growing.[citation needed]

Militarization of police[edit]

The militarization of both rural and urban law enforcement has been attributed to the United States' involvement in wars during the 20th century, although some attribute the militarization to the more recent campaigns on drugs and terror.[11][12] Historian Charles Beard argues that cultural change during the Great Depression encouraged the militarization of law enforcement,[13] whereas Harwood argues that the creation of SWAT teams and tactical units within law enforcement during the 1960s began such a trend.

In recent years, the use of military equipment and tactics for community policing and for public order policing has become more widespread under the 1033 program.[14][15] The program prompted discussion among lawmakers in 2014 after unrest in Ferguson, Missouri.[16][17] President Obama introduced restrictions in 2015 on the transfer of surplus military equipment to police. In 2017, the Trump administration announced it will reinstate the program.[18]

Styles of policing[edit]

Given the broad mandates of police work, and yet have limited resources, police administrators must develop policies to prioritize and focus their activities. Some of the more controversial policies restrict, or even forbid, high-speed vehicular pursuits. Researchers Falcone, Wells, & Weisheit's describe a historical separation of police models between small towns and larger cities. The distinction has also been defined between rural and urban policing models, which tended to function differently with separate hierarchical systems supporting each.[19]

Three styles of policing develop from a jurisdiction's socioeconomic characteristics, government organization, and choice of police administrators. According to a study by James Q. Wilson ("Varieties of Police Behavior", 1968, 1978, Harvard University Press), there were three distinct types of policing developed in his study of eight communities. Each style emphasized different police functions and was linked to specific characteristics of the community the department served. (Wilson's field of study was in the United States, and it is not clear if similar studies have been done for other countries with different governmental organization and laws).

  • Watchman. Emphasizes maintaining order, usually found in communities with a declining industrial base, and a blue-collar, mixed ethnic/racial population. This form of policing is implicitly less pro-active than other styles, and certain offenses may be "overlooked" on a variety of social, legal, and cultural grounds, as long as the public order is maintained. Cole and Smith comment the broad discretion exercised in this style of policing can result in charges of discrimination when it appears police treatment of different groups results in the perception that some groups get better treatment than others;
  • Legalistic. Emphasizes law enforcement and professionalism. This is usually found in reform-minded cities, with mixed socioeconomic composition. Officers are expected to generate a large number of arrests and citations and act as if there were a single community standard for conduct, rather than different standards for different groups. However, the fact that certain groups are more likely to have law enforcement contact means this strict enforcement of laws may seem overly harsh on certain groups;
  • Service. Emphasizes the service functions of police work, usually found in suburban, middle-class communities where residents demand individual treatment. Police in homogeneous communities can view their work as protecting their citizens against "outsiders", with frequent but often-informal interventions against community members. The uniform make-up of the community means crimes are usually more obvious, and therefore less frequent, leaving police free to deal with service functions and traffic control.

Wilson's study applies to police behavior for the entire department, over time. At any given time, police officers may be acting in a watchman, service, or legalistic function by nature of what they're doing at the time, or temperament, or mood. Individual officers may also be inclined to one style or another, regardless of the supervisor or citizen demands.

Community-oriented policing is a shift in policing practices in the U.S. that moved away from standardization and towards a more preventative model where police actively partner with the community it serves.[20]

Powers of officers[edit]

General powers[edit]

Law enforcement officers are granted certain powers to enable them to carry out their duties. When there exists probable cause to believe that a person has committed a serious crime, a law enforcement officer can handcuff and arrest a person, who will be held in a police station or jail pending a judicial bail determination or an arraignment.

The procedural use of strip searches and cavity searches by law enforcement has raised civil liberties concerns.[21][22][23] The practice of taking an arrested person on a perp walk, often handcuffed, through a public place at some point after the arrest, creating an opportunity for the media to take photographs and video of the event, has also raised concerns.[24]

In 2010, the FBI estimated that law enforcement agencies made 13,120,947 arrests (excluding traffic violations). Of those persons arrested, 74.5% were male and 69.4 percent of all persons arrested were white, 28.0 percent were black, and the remaining 2.6 percent were of other races.[25]

A law enforcement officer may briefly detain a person upon reasonable suspicion of involvement in a crime but short of probable cause to arrest. Contrary to popular belief and Hollywood-style depictions in TV and movies, merely lawfully detaining a person—in and of itself—does not deprive a person of their Fourth Amendment right against unlawful searches. Federal, state, and local laws, and individual law enforcement departmental policies govern when, where, how, and upon whom a law enforcement officer may perform a "pat down," "protective search," or "Terry frisk," based on several U.S. Supreme Court decisions (including Terry v. Ohio (1968), Michigan v. Long (1983), and Maryland v. Buie (1990)):[26]

In Terry v. Ohio, the landmark decision introducing the term "Terry frisk," or "frisk," to the broader public:

"Our evaluation of the proper balance that has to be struck in this type of case leads us to conclude that there must be a narrowly drawn authority to permit a reasonable search for weapons for the protection of the police officer, where he has reason to believe that he is dealing with an armed and dangerous individual, regardless of whether he has probable cause to arrest the individual for a crime. The officer need not be absolutely certain that the individual is armed; the issue is whether a reasonably prudent man in the circumstances would be warranted in the belief that his safety or that of others was in danger (italics added)."[27]

The New York City Police Department came under scrutiny in 2012 for its use of a stop-and-frisk program.[28][29][30]

Civil asset forfeiture[edit]

Rules on civil asset forfeiture allow law enforcement officers to seize anything which they can plausibly claim was the proceeds of a crime. The property-owner need not be convicted of that crime; if officers find drugs in a house, they can take cash from the house and possibly the house itself. Commentators have said these rules provide an incentive for law enforcement officers to focus on drug-related crimes rather than crimes against persons, such as rape and homicide. They also provide an incentive to arrest suspected drug-dealers inside their houses, which can be seized, and to raid stash houses after most of their drugs have been sold, when officers can seize the cash.[31][32]


Deadly force[edit]

In most states, law enforcement officers operate under the same self-defense laws as the citizens of that state[citation needed]. Generally, when the officer or an innocent party is at risk of serious bodily injury and/or death, lethal force is justified. Most law enforcement agencies establish a use of force continuum and list deadly force as a force of last resort. With this model, agencies try to control excessive uses of force[citation needed]. Nonetheless, some[who?] question the number of killings by law enforcement officers, including killings of people who are unarmed, raising questions about alleged widespread and ongoing excessive use of force.[33][34] Other non-fatal incidents and arrests have raised similar concerns.[35][36][37]



  • 1960's - The sixties was the height of the Civil Rights Movement and a lot of police misconduct came from protests that often turned violent. There were also planned attacks against police stemming directly from the force that was being used by the police, against the protesters. President Lyndon Johnson created the Office of Law Enforcement Assistance in 1965. From that, much was done on the federal and local level, such as enhanced training for police personnel. Police officers at that time were often made up of ex-military members that had little training and were left to learn their skills during their job experiences. Law enforcement personnel were also responsible to attend college as a result.[38]
  • 1965 - The Watts Riot of 1965 lasted six days and began following the arrest of Marquette Frye by a white California Highway Patrol officer on suspicion of driving while intoxicated. 34 people were killed and more than 1,000 were injured. The riots also caused over $40 million in damage.[39]
  • 1991 - In March 1991, Officers from the Los Angeles Police Department, while attempting to arrest Rodney King, used what many believed was excessive force. Four officers with LAPD used physical force on King after he resisted arrest. A bystander videotaped the incident and later supplied it to local media. The officers were charged with assault and using excessive force, with all officers acquitted of the assault, and three of the four officers acquitted of using excessive use of force, during the initial trial. This led to citywide riots, during which 63 people were killed and 2,373 were injured; it ended only after the California Army National Guard, the United States Army, and the United States Marine Corps provided reinforcements to re-establish control.[38]
  • 2006 - In 2006, Sean Bell was fatally shot on the night before his wedding. It was reported that the police had shot over 50 times at Bell and two of his friends that he was with.[40]
  • 2014 - In 2014, Michael Brown was shot by a police officer after struggling with the officer and attempting to take the officers gun. His death prompted citywide riots and protests that lasted approximately 5 days.[40]
  • 2016 - From the rise of social media and cell phones, it is now easy for people to broadcast police use of force incidents that they see. It started with Rodney King and has grown. More specifically, the death of Philando Castile. Castile's girlfriend live streamed the death of him on Facebook after he was shot by a police officer. This video had approximately 3.2 million views the next day.[41]

Entry qualifications[edit]


Nearly all U.S. states and the federal government have by law adopted minimum-standard standardized training requirements for all officers with powers of arrest within the state. Many standards apply to in-service training as well as entry-level training, particularly in the use of firearms, with periodic re-certification required. These standards often comply with standards promoted by the US Department of Justice. These standards typically require a thorough background check that potential police recruits:[42][43]

Repeated interviews, written tests, medical examinations, physical fitness tests, comprehensive background investigations, fingerprinting, drug testing, a police oral board interview, a polygraph examination and consultation with a psychologist are common practices used to review the suitability of candidates. Recruiting in most departments is competitive, with more suitable and desirable candidates accepted over lesser ones, and failure to meet some minimum standards disqualifying a candidate entirely. Police oral boards are the most subjective part of the process and often disqualifies the biggest portion of qualified candidates.[44] Departments maintain records of past applicants under review, and refer to them in the case of either reapplication or requests between other agencies.

Issues with recruitment[edit]

Despite these safeguards, some departments have at times relaxed hiring and staffing policies, sometimes in violation of the law, most often in the cases of local departments and federally funded drug task forces facing staffing shortages, attrition, and needs to quickly fill positions. This has included at times the fielding (and sometimes the arming) of uncertified officers (who may be working temporarily in what is supposed to be a provisional limited-duty status prior to certification) and the hiring of itinerant "gypsy cops", who may have histories of poor performance or misconduct in other departments.[45][46][47][48][49][50]

Police equipment[edit]


Police in the United States usually carry a handgun on duty. Many are required to be armed off-duty and often required to have a concealable off-duty handgun. Among the most common sidearms are models produced by Glock, Smith & Wesson, SIG Sauer, Beretta, and Heckler & Koch, usually in 9mm, .40 S&W, .357 SIG (US Secret Service and other Federal Law Enforcement agencies) or .45 ACP.

Until the late 1980s and early 1990s, most US police officers carried revolvers, typically in .38 Special or .357 Magnum calibers, as their primary duty weapons. At the time, Smith & Wesson, Colt, Ruger and some Taurus models were popular with police officers, most popular being the Smith & Wesson or Colt revolvers. Since then, most agencies have switched to semiautomatic pistols. Two key events influencing many US police forces to upgrade their primary duty weapons to weapons with greater stopping power and round capacity were the 1980 Norco shootout and the 1986 FBI Miami shootout.

Some police departments allow qualified officers to carry shotguns and/or semiautomatic rifles in their vehicles for additional firepower, typically to be used if a suspect is involved in an active shooter situation, or a hostage/barricade incident.

Less lethal weapons[edit]

ASP 21" tactical baton in collapsed and expanded states.

Police also often carry an impact weapon - a baton, also known as a nightstick. The common nightstick and the side handle baton have been replaced in many locations by expandable batons such as the Monadnock Auto-Lock Expandable Baton or ASP baton. One advantage of the collapsible baton is that the wearer can comfortably sit in a patrol vehicle while still wearing the baton on their duty belt. The side handle nightstick usually has to be removed before entering the vehicle. Many departments also use less-lethal weapons like mace, pepper spray, electroshock guns, and beanbag shotgun rounds.

Another less lethal weapon that police officers often carry is an electroshock gun, also known as a Taser. The handheld electroshock weapon was designed to incapacitate a single person from a distance by using electric current to disrupt voluntary control of muscles. Someone struck by a Taser experiences stimulation of his or her sensory nerves and motor nerves, resulting in strong involuntary muscle contractions. Tasers do not rely only on pain compliance, except when used in Drive Stun mode, and are thus preferred by some law enforcement over non-Taser stun guns and other electronic control weapons.

Specialized weapons[edit]

Most large police departments have elite SWAT units which are called in to handle situations, such as barricaded suspects, hostage situations and high-risk warrant service, that require greater force, specialized equipment, and special tactics. These units usually have submachine guns, automatic carbines or rifles, semiautomatic combat shotguns, sniper rifles, gas, smoke and flashbang grenades, and other specialized weapons and equipment at their disposal. Some departments are equipped with armored vehicles.

Body armor[edit]

Uniformed police officers often wear body armor, typically in the form of a lightweight Level IIA, II or IIIA vest that can be worn under service shirts. SWAT teams typically wear heavier Level III or IV tactical armored vests, often with steel or ceramic trauma plates, comparable to those worn by U.S. military personnel engaged in ground operations. Officers trained in bomb disposal wear specialized heavy protective armor designed to protect them from the effects of an explosion when working around live ordnance. Local police foundations have initiated programs to provide law enforcement agencies with higher level vests that provide greater protection and vests for police K-9s as well.[51][52]

Body-worn camera[edit]

Multiple states have pending body-worn camera legislation that requires its law enforcement to be equipped with body-worn cameras when the officers are on duty. Some of these states include California, Washington, and Illinois, among others.[53] Body-worn cameras are video recording devices around three inches long that cost between $129-$900.[54] There are different body-worn camera models, but a standard body-worn camera includes an on and off switch that enables the image capturing technology to record and store data in the cloud.

Body-worn cameras have become standard due to the rise of civilian complaints about police brutality across the nation.[55] Supporters argue that the use of a body-worn camera allows evidence to be viewed from an unbiased perspective. Corporations are currently working on body-worn camera models that will resolve the technology's limitations such as better audio capturing technology and battery life, to name a few.


In recent years police have recruited unmanned surveillance devices, such as small throwable robotics and flying drones, to do recon in dangerous locations. These devices can be used to identify the presence of a hostage, locate and/or identify subjects and reveal the layout of a room, the device does all this by transmitting real-time audio and video to the pilot.[56] This device gives police an advantage when they cannot directly see a suspect or enter a location where they're needed.[57] Some other uses for this device may be bomb detection, as well as searching suspicious vehicles.[58]

Flying drones are also being enlisted to help police in dangerous situations such as a barricaded suspect or a hostage situation. These drones increase safety by providing information that can be used in mapping and planning.[59] These devices equipped with cameras allow officers to get a bird's eye view of a scene in an emergency.[57] The device allows emergency responders to safely get much closer to a scene that they could if they went in on foot.[57]

Police communications[edit]


Most American police departments are dispatched from a centralized communications center, using VHF, UHF or, more recently, digitally trunked radio transceivers mounted in their vehicles, with individual officers carrying portable handsets or ear-worn headsets for communication when away from their vehicles. American police cars are also increasingly equipped with mobile data terminals (MDT's)or portable computers linked by radio to a network allowing them access to state department of motor vehicles information, criminal records, and other important information.

Most police communications are now conducted within a regional pool of area telecommunicators or dispatchers using 9-1-1 and 9-1-1 telephone taxation. A large number of police agencies have pooled their 9-1-1 tax resources for Computer Aided Dispatching (CAD) to streamline dispatching and reporting. CAD systems are usually linked to MDT's (see above).

National Law Enforcement Telecommunications System[edit]

A variety of national, regional, state and local information systems are available to law enforcement agencies in the U.S., with different purposes and types of information. One example is the National Law Enforcement Telecommunications System (NLETS),[60] an interstate justice and public safety network owned by the states supporting inquiry into state systems for criminal history, driver's license and motor vehicle registration, as well as supporting inquiry into federal systems, such as the Department of Homeland Security (DHS) U.S. Immigration and Customs Enforcement (ICE) Law Enforcement Support Center, the Drug Enforcement Administration (DEA) National Drug Pointer Index (NDPIX), and the Federal Aviation Administration (FAA) Aircraft Registry, plus the Government of Canada's Canadian Police Information Centre (CPIC).[61]

NLETS operates primarily through a secure private network through which each state has an interface to the network, and all agencies within the state operate through this portal. The federal and international components operate very similarly. Users include all United States and territories, Federal agencies with a justice mission, and certain international agencies. The primary operational site for the network is housed in Arizona, with a secure backup site located in the East Central U.S.

Through the NLETS network, law enforcement and criminal justice agencies can access a wide range of information, from standard driver license and vehicle queries to criminal history and Interpol information.[62] Operations consist of nearly 1.5 billion transactions a year to over 1 million PC, mobile and handheld devices in the U.S. and Canada at 45,000 user agencies, and to 1.3 million individual users.[60]


Police departments share arrest information with third-party news organizations that archive names of citizens and legal allegations in a "police blotter". However, if the allegations are dismissed in court a citizen may not petition the third-party for removal.

Number of police[edit]

In 2008, federal police employed approximately 120,000 full-time law enforcement officers, authorized to make arrests and carry firearms in the United States.[63]

The 2012 Bureau of Justice Statistics' Census of State and Local Law Enforcement Agencies (CSLLEA), found there were 17,985 state and local law enforcement agencies employing at least one full-time officer or the equivalent in part-time officers.[64]

In 2008, state and local law enforcement agencies employed more than 1.1 million people on a full-time basis, including about 765,000 sworn personnel (defined as those with general arrest powers). Agencies also employed approximately 100,000 part-time employees, including 44,000 sworn officers.[64]

From 2004 to 2008, overall full-time employment by state and local law enforcement agencies nationwide increased by about 57,000 (or 5.3%). Sworn personnel increased by about 33,000 (4.6%), and nonsworn employees by about 24,000 (6.9%). From 2004 to 2008, the number of full-time sworn personnel per 100,000 U.S. residents increased from 250 to 251.[64] From 1992 to 2008, the growth rate for civilian personnel was more than double that of sworn personnel.[65]

Local police departments were the largest employer of sworn personnel, accounting for 60% of the total. Sheriffs' offices were next, accounting for 24%. About half (49%) of all agencies employed fewer than 10 full-time officers. Nearly two-thirds (64%) of sworn personnel worked for agencies that employed 100 or more officers.[64]


Historically speaking, law enforcement has been a male-dominated profession. Approximately 18,000 law enforcement agencies make up this country ranging from federal, state, and local police with more than 1.1 million people employed.[66] There are around 12,000 local law enforcement agencies, obviously the biggest out of the three types.[66] In the most recent of surveys done in 2013, the Law Enforcement Management and Administrative Statistics found that 72.8% of local police offices are made up of white people. Black or African American came in second with 12.2% and Latino or Hispanic came in third with just 11.6%. Women made up only 17% of full-time sworn in officers.[66] This huge gap in gender and in a race has set off a national trend for police departments to become more diverse. Law enforcement and more specifically police have made an effort to become more diverse in order to establish a better community relationship with police. This comes as a direct result from the police-related shootings and riots that have occurred within the past decade as tension is growing between police and the communities that they serve.[66]

Changes in personnel numbers[edit]

Fifteen of the 50 largest local police departments employed fewer full-time sworn personnel in 2008 than in 2004. The largest declines were in Detroit (36%), Memphis (23%), New Orleans (13%), and San Francisco (10%).[64]

Ten of the 50 largest local police departments reported double-digit increases in sworn personnel from 2004 to 2008. The largest increases were in Phoenix (19%), Prince George's County (Maryland) (17%), Dallas (15%), and Fort Worth (14%).[64]


Salary varies widely for police officers, with most being among the top third of wage-earners, age 25 or older, nationwide.[67] In May 2012, the overall median was $56,980. The top 10% earned more than $93,450 and bottom 10% less than $33,060.[68]

The median wages for police and detective occupations in May 2012 were as follows:[68]

  • $74,300 for detectives and criminal investigators
  • $55,270 for police and sheriff's patrol officers
  • $55,210 for transit and railroad police
  • $48,070 for fish and game wardens


See also[edit]




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