Just as the dominant model of policing was being challenged, the U.S. Supreme Court initiated a “rights revolution” that placed new restrictions on police searches and interrogations. In a series of rulings on due process that applied the Bill of Rights to state actions, the court extended the exclusionary rule to the states, forbidding the use at trial of evidence obtained as a result of an unlawful search and seizure by police (Mapp v. Ohio [1961]); held that a suspect is entitled to the presence of an attorney during interrogation at a police station and that denying a request for counsel is a violation of the suspect’s constitutional rights that renders any statements made by the suspect inadmissible in court (Escobedo v. Illinois [1964]); and required that a suspect be informed of his rights before the police began a custodial interrogation (Miranda v. Arizona [1966]). Those decisions directly affected the day-to-day investigative activities of police. They also helped to improve the professionalism of police officers, because departments reacted to their increased liability by raising recruitment standards, improving legal training for officers, and establishing procedures for investigating officers to follow in the handling and arresting of suspects.

Community policing

Meanwhile, many police departments in the United States sought to increase their effectiveness by improving their relationships with the communities in which they worked. Community relations programs were established by many departments in the mid-20th century, and the “team policing” strategy was adopted in New York City and other areas in the 1970s. Later, in the 1980s and ’90s, an increasing number of departments employed an approach known as community policing, which many observers saw as a revival of the more socially conscious policing methods of Peel and the London Metropolitan Police.

Beginning in the 1940s, some police departments created communication and education programs aimed at ethnic minority communities. Those initiatives were based on the ideas of the American sociologist Joseph D. Lohman, who studied the interaction of police and minority groups, and the psychologist Gordon W. Allport, who studied the nature of prejudice. One goal of such programs was to enable police to understand and overcome their prejudice toward minorities and thereby improve their treatment of members of those groups. Although the programs drew support from the National Conference of Christians and Jews (now the National Conference for Community and Justice) and the National Institute on Police and Community Relations, most of them took the form of specialized community-relations units staffed by minority officers. However, those units received little support from rank-and-file police officers and eventually degenerated into public-relations efforts aimed at overcoming community dissatisfaction with police tactics. Their failure was made apparent by the violent confrontations between police and minority groups during the civil disturbances of the 1960s.

Team policing was introduced in the early 1970s in New York City. Patterned after earlier efforts in Britain, the approach emphasized the delivery of round-the-clock decentralized patrol services by a team of officers, usually under the direction of a sergeant or lieutenant, in a specific geographic area. Team commanders were responsible for conditions in the patrol area, regardless of whether they were on duty. Deployment decisions were made in consultation with local leaders and residents. The fixed territorial responsibility of the teams, it was hoped, would break down barriers between residents and police, enable police to provide services tailored to the needs of residents, and improve the job satisfaction of police officers. However, studies of the effectiveness of team policing in several cities in the United States failed to show an improvement over the crime-fighting model. Resistance by police administrators, resentment by officers on the street, and inadequate training eventually contributed to the demise of team policing by the mid-1970s.

During this period a new wisdom began to emerge, one that fully recognized the complexity of the tasks that police perform in society. Police administrators as well as researchers and other outside observers maintained that police deal with many behaviors that are not defined as criminal, that many of the functions of police concerning noncriminal behavior are as important as their traditional tasks of enforcing public order, that there are many methods that police use to perform their duties, that police must be afforded discretion in carrying out their duties (particularly regarding whether to arrest a suspect), that a police force that is not in close contact with its community will have difficulty controlling crime and disorder, and that police must be accountable to elected officials and to the public.

The new wisdom led in the 1980s to the gradual displacement of the professional crime-fighting model by a set of strategies and programs collectively known as community policing. The basic premise of community policing is that the police should involve the community in their efforts to prevent and control crime and to solve communitywide problems. Community policing departs from the crime-fighting model by making the police officer a neighborhood problem solver rather than an incident-driven crime fighter. Police officers assigned to community-policing duties are expected to maintain close contact with the community and to become familiar with its residents and its problems through foot patrols, community meetings, and service at police substations. The same familiarity with the community is also expected of police administrators.

Advocates of community policing believe that the approach mobilizes a variety of resources to solve problems that affect community safety and stability over the long term. They also contend that the more traditional crime-fighting model allows problems to fester by simply responding to incidents as they occur rather than addressing their underlying causes.

A considerable body of research also supported the move toward community policing. The American legal scholar Herman Goldstein argued in Problem-Oriented Policing (1990) that rapid-response, incident-based policing paid insufficient attention to the underlying community problems that create the majority of the incidents to which police departments must respond. In “Broken Windows: The Police and Neighborhood Safety,” a groundbreaking article published in 1982, the American political commentator James Q. Wilson and the American criminologist George L. Kelling maintained that the incidence as well as the fear of crime is strongly related to the existence of disorderly conditions in neighborhoods. Using the metaphor of a broken window, they argued that a building in a constant state of disrepair conveys the impression that it has been abandoned and encourages criminals or delinquents to damage it further. As the building is eventually destroyed, nearby residents grow less concerned about their neighborhood and community, which leads to an increase in incivility and disorderly behavior. Such behavior in turn creates public fear and encourages those with means to leave the neighborhood, which eventually becomes crime-ridden and unlivable for those who remain. According to Wilson and Kelling, the crime-fighting model of policing ignores the law enforcement equivalent of broken windows.

Wilson and Kelling argued that police departments should institute patrol tactics designed to counteract disorder and to preserve the community in troubled neighborhoods. The visibility of police in those areas deters potential criminals and generates goodwill among law-abiding citizens, who are encouraged to assert control over their public spaces. The problem of crime and community safety then become the responsibilities of both residents and police.

Community policing became part of a national strategy to combat crime in the United States in the 1990s. Legislation enacted in 1994 provided for the hiring of 100,000 new community police officers and the establishment of the Office of Community Oriented Policing Services, under the jurisdiction of the Department of Justice. By the early 21st century, some two-thirds of local police departments in the United States, employing some nine-tenths of the country’s police officers, had a community-policing plan of some type. (In many police departments, organized subunits, rather than the entire police force, carried out community policing.)

Despite its widespread adoption, community policing has faced obstacles. Some police administrators have been reluctant to support programs that require officers on the street to exercise considerable discretion and authority, especially in departments where such officers lack experience or are otherwise ill-prepared to identify and address complex community problems. Other administrators have continued to believe that the more traditional crime-fighting model, despite its deficiencies, is still an effective overall policing strategy.

Compstat

In the late 20th century, police agencies and departments throughout the United States and in some areas of Britain began adopting computerized systems, known as Compstat (computerized statistics), that could be used to plot specific incidents of crime by time, day, and location. By revealing previously unnoticed patterns in criminal activity, Compstat enabled police departments to allocate their resources more effectively, and it was credited with significant decreases in crime rates in several of the cities in which it was used. Compstat became so widely used (in the United States) that many police administrators began to regard it as the basis of a new model of policing for the 21st century. Be that as it may, Compstat has proved to be compatible with policing strategies based on the crime-fighting model, the community-policing model, or a mixture of the two.