Sworn police officers are those who have taken an oath to
support the Constitution of the United States, their state, and the laws of their agency’s jurisdiction. Sworn officers also have the responsibility to ensure the safety and quality of life of the communities they serve. The basic duties and types of sworn police officers are summarized below.
The Nature of the Work
People depend on police officers protect their lives and property. Police officers, some of whom are state or federal special agents or inspectors, perform these duties in a variety of ways depending on the size and type of their organization.
Officers and detectives maintain a helpful presence in their communities. Most patrol their jurisdictions. They may coordinate traffic, visit local businesses, or respond to calls for service. A large proportion of their time is spent writing reports, maintaining records of incidents they encounter, and interacting with the communities as they conduct their daily activities. Detectives, who are often referred to as agents or investigators, perform investigative duties such as gathering facts and collecting evidence.
The daily activities of police officers and detectives differ depending on their occupational specialty–such as police officer, game warden, or detective–and whether they are working for a local, state, or federal agency. Duties also differ substantially among various federal agencies. Regardless of job duties or location, police officers at all levels must write reports and maintain meticulous records.
There are many different types of police agencies, from small town police departments to large U.S. federal agencies. The types of jobs available will depend on the type of agency, its mission, size, and jurisdiction. These are important considerations when selecting the agency that is right for you and your interests.
Types of Police Agencies
There are 94 U.S. federal agencies and 45 offices of inspector general that employ full time personnel authorized to make arrests and carry firearms. According to the Bureau of Justice Statistics, in 2020 the largest employers of federally employed officers were U.S. Customs and Border Protection, Federal Bureau of Prisons, the FBI, and U.S. Immigration and Customs Enforcements, each with over 12,000 full-time police officers. Federal officers’ duties include police response and patrol, criminal investigation and enforcement, inspections, security and protection, court operations, and corrections.
There are more than 17,500 state and local police agencies in the United States, ranging in size from one officer to more than 30,000. Many of these are municipal police departments operated by local governments, though there are several types of police agencies.
Local Police includes municipal, county, tribal, and regional police that derive authority from the local governing body that created it. The primary purpose is to uphold the laws of the jurisdiction, provide patrol, and investigate local crimes.- State Police / Highway Patrol – State police often perform police duties to include highway patrol and statewide investigations. Some states have only highway patrol with investigative functions covered by a separate entity such as a state bureau of investigation. State police assist local police with investigations and emergencies that extend beyond the resources and jurisdictional boundaries of the local agency.
- Special Jurisdiction Police – Officers for special jurisdictions provide police services for defined entities or areas within another jurisdiction. These include parks, schools, transportation assets (e.g., airports, subways), hospitals, housing authorities, and government buildings. Special jurisdiction police are generally full-service departments, offering the same services as local police.
- Deputy Sheriffs – Generally sheriff’s offices are granted authority by the state to enforce state law at the local county level. Deputies commonly run the local jail, serve warrants and court summons, and respond to calls for service in areas outside local police jurisdictions.
While not a type of police agency, one designation to look for when evaluating departments is CALEA Accreditation.

CALEA, which stands for the Commission on Accreditation for Law Enforcement Agencies, is the international authority on law enforcement standards. The Commission offers several prestigious credentialing programs for public safety agencies, including Law Enforcement, Public Safety Communications, and Public Safety Training Academy Accreditation.
CALEA Law Enforcement Accreditation is a voluntary program open to all types of law enforcement agencies. Accreditation involves the systematic review of an agency’s policies and procedures against CALEA’s internationally accepted Standards for Law Enforcement Agencies©. These standards reflect the current thinking and experience of law enforcement practitioners and researchers and are considered benchmarks for modern law enforcement agencies.
There are currently over 950 law enforcement agencies enrolled in the CALEA Law Enforcement Accreditation Program and over 800 law enforcement agencies in the U.S. are accredited.
For more information on CALEA, or to find a list of accredited agencies, visit www.calea.org.
Source: Commission on Accreditation for Law Enforcement Agencies (CALEA). 2023 Annual Report. Accessed December 19, 2024. https://calea.org/annual-reports/2023-annual-report/#page=12.
Types of Careers in Policing
Uniformed police officers have general policing duties, including maintaining regular patrols and responding to calls for service. Much of their time is spent responding to calls and doing paperwork. They may direct traffic at the scene of an accident, investigate a burglary, or give first aid to an accident victim. They are also responsible for building relationships with the residents of local neighborhoods. In large police departments, officers usually are assigned to a specific type of duty, such as bicycle patrol, foot patrol, etc.
Agencies are usually organized into geographic districts, with uniformed officers assigned to patrol a specific area such as part of the business district or outlying residential neighborhoods. Officers may work alone or with a partner. While on patrol, officers attempt to become thoroughly familiar with their patrol area, the community, and remain alert for anything unusual. Hazards to public safety are investigated or noted, and officers are dispatched to individual calls for assistance. During their shift, they may engage with the community; enforce laws; or issue warnings or citations.
Special jurisdiction police agencies have unique responsibilities and geographic areas of authority. These include federal agencies such as the United States Capitol Police and United States Park Police. Public college and university police, school resource officers, and transit police ensures safety within their specific environments. School resource officers provide services to students and the communities they serve. Most officers are uniformed, with some serving as investigators, playing key roles in maintaining order and security.
Sheriffs and deputy sheriffs typically have jurisdiction at the county level. Sheriffs are usually elected to their posts and perform duties similar to those of the local or county police chief. Deputy sheriffs often have law enforcement duties similar to those of uniformed officers within police departments. In addition to these roles, sheriff’s offices are often responsible for managing county jails, overseeing court security, and serving warrants and legal documents. They may also patrol unincorporated areas of the county, providing law enforcement services in regions not covered by municipal police departments.
Tribal Police are responsible for law enforcement on American Indian and Alaska Native lands. Jurisdictional authority to enforce tribal, state, and federal laws varies by tribe and state. Tribal police officers play a crucial role in preserving the safety, sovereignty, and cultural heritage of their communities while providing services similar to those of municipal police. Their duties often include patrol, criminal investigations, community outreach, and collaboration with local, state, and federal agencies such as the Bureau of Indian Affairs and the Federal Bureau of Investigations to address crime on tribal lands.
State police officers, sometimes called state troopers or highway patrol officers, patrol highways to enforce motor vehicle laws and regulations. State police officers often issue traffic warnings or citations to motorists. At the scene of collisions, they may direct traffic, give first aid, and call for emergency equipment. They also write reports used to determine the cause of the accident. State police officers are frequently called upon to provide comprehensive police services, especially in rural areas or small towns.
State police agencies operate in almost every state with the United States. Most full-time sworn personnel are uniformed officers who regularly patrol and respond to calls for service. Others work as investigators, perform court-related duties, or carry out administrative or other assignments.
Fish and game wardens enforce fishing, hunting, and boating laws. They patrol hunting and fishing areas, conduct search and rescue operations, investigate complaints and accidents, and aid in prosecuting court cases.
The U.S. Federal Government works in many areas of policing. Federal
Bureau of Investigation (FBI) agents are the government’s principal investigators, responsible for investigating violations of more than 200 categories of federal law and conducting sensitive national security investigations. Agents may conduct surveillance, monitor court-authorized wiretaps, examine business records, investigate white-collar crime, or participate in sensitive undercover assignments. The FBI investigates a wide range of criminal activity, including organized crime, public corruption, financial crime, bank robbery, kidnapping, terrorism, espionage, drug trafficking, and cyber crime.
There are many other federal agencies that enforce particular types of laws. U.S. Drug Enforcement Administration (DEA) agents enforce laws and regulations relating to illegal drugs. U.S. Marshals and Deputy Marshals protect the federal courts and ensure the effective operation of the judicial system. Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF)agents enforce and investigate violations of federal firearms and explosives laws, as well as federal alcohol and tobacco tax regulations. The U.S. Department of State Bureau of Diplomatic Security special agents are engaged in the battle against terrorism.
The Department of Homeland Security also employs numerous police officers within several different agencies, including Customs and Border Protection, Immigration and Customs Enforcement, and the U.S. Secret Service. U.S. Border Patrol agents protect more than 8,000 miles of international land and water boundaries. Immigration inspectors interview and examine people seeking entrance to the United States and its territories. Customs inspectors enforce laws governing imports and exports by inspecting cargo, baggage, and articles worn or carried by people, vessels, vehicles, trains, and aircraft entering or leaving the United States. Federal Air Marshals provide air security by guarding against attacks targeting U.S. aircraft, passengers, and crews. U.S. Secret Service special agents and U.S. Secret Service uniformed officers protect the President, Vice President, their immediate families, and other public officials. Secret Service special agents also investigate counterfeiting, forgery of government checks or bonds, and fraudulent use of credit cards.
Other federal agencies employ police and special agents with sworn arrest powers and the authority to carry firearms. These agencies include the Postal Service, the Bureau of Indian Affairs Office of Law Enforcement, the Forest Service, and the National Park Service.
Specialized assignments are available after at least two years of regular patrol duties. Officers can specialize in a particular field, such as chemical and microscopic analysis, training and firearms instruction, or handwriting and fingerprint identification. Others work with special units, such as horseback, bicycle, motorcycle, or harbor patrol; canine corps; special weapons and tactics (SWAT); or emergency response teams. A few local and special police officers primarily perform jail-related duties or work in courts.
Detectives are plainclothes investigators who gather facts and collect evidence for criminal cases. Some are assigned to interagency task forces to combat specific types of crime. They conduct interviews, examine records, observe the activities of suspects, and participate in raids or arrests. Detectives and state and federal agents and inspectors usually specialize in investigating one type of violation, such as homicide or fraud. They are assigned cases on a rotating basis and work on them until an arrest and conviction is made or until the case is dropped.
Source: Bureau of Labor Statistics, U.S. Department of Labor, Occupational Outlook Handbook, 2008-09 Edition, Police and Detectives.