Police in the context of "Search and seizure"

Law enforcement is the activity of some members of the government or other social institutions who act in an organized manner to enforce the law by investigating, deterring, rehabilitating, or punishing people who violate the rules and norms governing that society. The term encompasses police, courts and corrections. These three components of the criminal justice system may operate independently of each other or collectively through the use of record sharing and cooperation. Throughout the world, law enforcement are also associated with protecting the public, life, property, and keeping the peace in society.

The concept of law enforcement dates back to ancient times, and forms of law enforcement and police have existed in various forms across many human societies. Modern state legal codes use the term law enforcement officer or peace officer to include every person vested by the legislating state with police power or authority; traditionally, anyone sworn or badged who can arrest any person for a violation of criminal law is included under the umbrella term of law enforcement.

A public service or service of general (economic) interest is any service intended to address the needs of aggregate members of a community, whether provided directly by a public sector agency, via public financing available to private businesses or voluntary organisations, or by private businesses subject to government regulation. Some public services are provided on behalf of a government's residents or in the interest of its citizens. The term is associated with a social consensus (usually expressed through democratic elections) that certain services should be available to all, regardless of income, physical ability or mental acuity. Examples of such services include the fire services, police, air force, paramedics and public service broadcasting.

Even where public services are neither publicly provided nor publicly financed, they are usually subject to regulation beyond that applying to most economic sectors for social and political reasons. Public policy, when made in the public's interest and with its motivations, is a type of public service.

The Police (Polish: Policja, [pɔˈlit͡sja] ) is the national civilian police service of Poland. It is the country’s primary law enforcement agency, responsible for public security and order as well as the prevention and investigation of crime. It operates under the authority of the Ministry of the Interior and Administration.

Polish Police is headed by the Commander-in-Chief of Police, subordinate to the Minister of the Interior and Administration. The Police is supported by municipal forces of city guards, having less legal authority and with jurisdiction only over prosecuting contraventions.

A law enforcement agency (LEA) is any government agency responsible for law enforcement within a specific jurisdiction through the employment and deployment of law enforcement officers and their resources. The most common type of law enforcement agency is the police, but various other forms exist as well, including agencies that focus on specific legal violation, or are organized and overseen by certain authorities. They typically have various powers and legal rights to allow them to perform their duties, such as the power of arrest and the use of force.

Protest policing or public order policing is part of a state’s response to political dissent and social movements. Police maintenance of public order during protest is an essential component of liberal democracy, with military response to protest being more common under authoritarian regimes.

Australasian, European, and North American democratic states have all experienced increased surveillance of protest movements and more militarized protest policing since 1995 and through the first decades of the 21st century.

An arrest is the act of apprehending and taking a person into custody (legal protection or control), usually because the person has been suspected of or observed committing a crime. After being taken into custody, the person can be questioned further or charged. An arrest is a procedure in a criminal justice system, sometimes it is also done after a court warrant for the arrest.

Police and various other officers have powers of arrest. In some places, a citizen's arrest is permitted; for example in England and Wales, any person can arrest "anyone whom he has reasonable grounds for suspecting to be committing, have committed or be guilty of committing an indictable offence", although certain conditions must be met before taking such action. Similar powers exist in France, Italy, Germany, Austria and Switzerland if a person is caught in an act of crime and not willing or able to produce valid ID.

A police state is a state whose government institutions exercise an extreme level of control over civil society and liberties. There is typically little to no distinction between the law and the exercise of political power by the executive, and the deployment of internal security and police forces play a heightened role in governance. A police state is a characteristic of authoritarian, totalitarian or illiberal regimes (contrary to a liberal democratic regime). Such governments are not exclusive to simply one-party states or dominant-party states, as they can also arise in a democracy or multi-party system.

Originally, a police state was a state regulated by a civil administration, but since the beginning of the 20th century it has "taken on an emotional and derogatory meaning" by describing an undesirable state of living characterized by the overbearing presence of civil authorities. The inhabitants of a police state may experience restrictions on their mobility, or on their freedom to express or communicate political or other views, which are subject to police monitoring or enforcement. Political control may be exerted by means of a secret police force that operates outside the boundaries normally imposed by a constitutional state. Robert von Mohl, who first introduced the rule of law to German jurisprudence, contrasted the Rechtsstaat ("legal" or "constitutional" state) with the anti-aristocratic Polizeistaat ("police state").

Riot police are police who are organized, deployed, trained or equipped to confront crowds, protests or riots.

Riot police may be regular police officers who act in the role of riot police in particular situations, or they may be separate units organized within or in parallel to regular police forces. Riot police are used in a variety of different situations and purposes. They may be employed to control riots as their name suggests, to disperse or control crowds, to maintain public order or discourage criminality, or to protect people or property. The militarization of modern police has brought militaristic riot gear and new technologies that allow for their duties to expand above normal police duties.

Criminal investigation is an applied science that involves the study of facts that are then used to inform criminal trials. A complete criminal investigation can include searching, interviews, interrogations, evidence collection and preservation, and various methods of investigation. Modern-day criminal investigations commonly employ many modern scientific techniques known collectively as forensic science.

Criminal investigation is an ancient science that may have roots as far back as c. 1700 BCE in the writings of the Code of Hammurabi. In the code, it is suggested that both the accuser and the accused had the right to present evidence they collected. In the modern era, criminals investigations are most often done by government police forces. Private investigators are also commonly hired to complete or assist in criminal investigations.