A body sanctioned by local, state, or national government to enforce laws and apprehend those who break them.
The police force as we know it came into being in England in the 1820s when Sir Robert Peel established London's first municipal force. Before that, policing had either been done by volunteers or by soldiers. Police officers in the twenty-first century have technological advantages at their disposal to help them solve crimes, but most rely primarily on training and instinct to do their work.
In the United States, policing was originally done by the "watch system" in which local citizens would go on patrol and look for criminal activity. As cities grew, so did the amount of crime, and it became impossible to control it through volunteers. In the mid-1840s, New York City established the first paid professional police force in the United States. By the end of the nineteenth century, major cities across the nation had their own police forces. Regional police organizations were also established. Federal policing agencies such as the U.S. Park Police (who patrolled national parks), the Postal Inspectors (who helped ensure safe mail delivery) and the Border Patrol (which kept criminals from sneaking into or out of the country) were introduced. In 1905, Pennsylvania established the nation's first state police; other states quickly followed suit.
During the first decades of the twentieth century, police forces were established in smaller municipalities, and police officers took a more active role in fighting crime and protecting citizens. The widespread introduction of telephones and automobiles made it easier for police to respond quickly to emergencies.
Over the ensuing years, many of the techniques and tools commonly associated with police work?mug shots, fingerprint analysis, centralized records, crime labs?were introduced and constantly improved. Although the
scenarios commonly created by television police shows are exaggerations of how much technology can actually do, such innovations as DNA testing have made it easier for the police to positively identify criminals.
The average duties of the modern police officer can vary widely from community to community. In a large city whose police force has dozens of divisions and neighborhood precincts, an officer's duties may be quite specialized. In a small town with a police force of only a few people, each officer will likely...