A police officer (also known as a constable in some countries) is employed in most cases by federal, state/provincial or municipal governments and has the responsibility (or duty) of enforcing federal, state/provincial laws along with municipal/city ordinances. They also have the responsibility of keeping the public peace. This is usually done by uniformed pro-active patrolling within their jurisdiction looking for and investigating law breakers, and by responding to calls for service. Police officers are required to keep notes of all situations in which they take action and appear as witnesses during both criminal prosecutions and civil litigation. One of the lesser-known but most time-consuming duties of officers is completion of documentation of activity ("reporting").



It must be noted that the responsibilities of a police officer/constable are extremely broad and not in any way limited to the duties mentioned above. Police are expected to be able to respond in some fashion to any and all situations that may arise while they are on duty. Also police must act as government officials in the cases of investigation. In some communities rules and procedures governing conduct and duties of police officers requires that they act if needed even when off duty.

People depend on police officers and detectives to protect their lives and property. Law enforcement 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. In most jurisdictions, they are expected to exercise authority when necessary, whether on or off duty.

Uniformed police officers have general law enforcement duties, including maintaining regular patrols and responding to calls for service. They may direct traffic at the scene of an accident, investigate a burglary, or give first aid to an accident victim. In large police departments, officers usually are assigned to a specific type of duty. Many urban police agencies are involved in community policing, a practice in which an officer builds relationships with the citizens of local neighborhoods and mobilizes the public to help fight crime.

Some police officers specialize in such diverse fields 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 law enforcement officers primarily perform jail-related duties or work in courts. Regardless of job duties or location, police officers and detectives at all levels must write reports and maintain meticulous records that will be needed if they testify in court.

Sheriffs and deputy sheriffs enforce the law on the county level. Sheriffs are usually elected to their posts and perform duties similar to those of a local or county police chief. Sheriffs' departments tend to be relatively small, most having fewer than 50 sworn officers. Deputy sheriffs have law enforcement duties similar to those of officers in urban police departments.

State police officers (sometimes called State troopers or highway patrol officers) arrest criminals Statewide and patrol highways to enforce motor vehicle laws and regulations. State police officers are best known for issuing traffic citations to motorists. At the scene of accidents, they may direct traffic, give first aid, and call for emergency equipment.

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.

Police and detective work can be very dangerous and stressful. In addition to the obvious dangers of confrontations with criminals, police officers and detectives need to be constantly alert and ready to deal appropriately with a number of other threatening situations. Many law enforcement officers witness death and suffering resulting from accidents and criminal behavior. A career in law enforcement may take a toll on their private lives.

Police and sheriff's patrol officers had median annual earnings of $45,210 in May 2004. The middle 50 percent earned between $34,410 and $56,360. The lowest 10 percent earned less than $26,910, and the highest 10 percent earned more than $68,880. Median annual earnings were $44,750 in Federal Government, $48,980 in State government, and $45,010 in local government. The opportunity for public service through law enforcement work is attractive to many because the job is challenging and involves much personal responsibility. Furthermore, law enforcement officers in many agencies may retire with a pension after 25 or 30 years of service, allowing them to pursue a second career while still in their 40s or 50s. Because of relatively attractive salaries and benefits, the number of qualified candidates exceeds the number of job openings in Federal law enforcement agencies and in most State police departments' resulting in increased hiring standards and selectivity by employers.

Candidates must be U.S. citizens, usually must be at least 20 years of age, and must meet rigorous physical and personal qualifications. Physical examinations for entrance into law enforcement often include tests of vision, hearing, strength, and agility. Eligibility for appointment usually depends on performance in competitive written examinations and previous education and experience. In larger departments, where the majority of law enforcement jobs are found, applicants usually must have at least a high school education, and some departments require a year or two of college coursework. Federal and State agencies typically require a college degree. Candidates should enjoy working with people and meeting the public.

Because personal characteristics such as honesty, sound judgment, integrity, and a sense of responsibility are especially important in law enforcement, candidates are interviewed by senior officers, and their character traits and backgrounds are investigated. In some agencies, candidates are interviewed by a psychiatrist or a psychologist or given a personality test. Most applicants are subjected to lie detector examinations or drug testing.

Before their first assignments, officers usually go through a period of training. In State and large local departments, recruits get training in their agency's police academy, often for 12 to 14 weeks. In small agencies, recruits often attend a regional or State academy. Training includes classroom instruction in constitutional law and civil rights, State laws and local ordinances, and accident investigation. Recruits also receive training and supervised experience in patrol, traffic control, use of firearms, self-defense, first aid, and emergency response. Police departments in some large cities hire high school graduates who are still in their teens as police cadets or trainees.