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Police officers, also known as police officers, police or policewomen, are guaranteed legal employees of police officers. In most countries, "police officer" is a generic term and no specific rank is assigned. In some cases, the rank of "officer" is legally reserved for military personnel.

The police are usually responsible for arresting criminals, preventing and investigating crimes, protecting and helping the general public and maintaining public order. The police may be sworn in and have the right to arrest others and detain them for a limited period of time, among other duties. Some officials are trained in special duties, such as counter-terrorism, surveillance, child protection, VIP Protection, civil law enforcement and investigative techniques for major crimes, including fraud, rape, murder and drug trafficking. Although many police officers wear corresponding uniforms, some still wear plain clothes to disguise themselves as civilians. In most countries, the police are not bound by certain laws in the performance of their duties. For example, police officers may use force when necessary to arrest or detain people who are usually beaten. Officials can also perform their duties in violation of road rules.

The responsibilities of the police are diverse and can vary greatly from one political background to another. Typical duties involve maintaining peace, enforcing law, protecting people and property, and investigating crime. The officer shall respond to all situations while on duty. Rules and guidelines set out the way officers behave in the community and, in many cases, impose restrictions on those in uniform. In some countries, rules and procedures oblige police officers to intervene in criminal matters, even if they are not on duty. Police officers in almost all countries retain their legal authority when they leave work.

In most western legal systems, the main role of the police is to maintain order, maintain peace by monitoring the public, and subsequently report and arrest those suspected of violating the law. They can also prevent crime through highly visible policing, and most police forces have investigative capabilities. The police have the legal power to arrest and detain, which is usually authorized by the magistrates. Police officers also respond to emergency calls and daily community policing.

Police are often used as emergency services and may provide public safety functions in large gatherings as well as in emergencies, disasters, search and rescue situations and road traffic conflicts. In order to respond quickly in an emergency, the police often coordinate their actions in fire fighting and emergency medical services. In some countries, individuals work together as police and firefighters (creating the role of fire police). In many countries, there is a common emergency service number that can call police, firefighters or medical services into an emergency. Some countries (e.g. the UK) have outlined the order procedures for major emergencies or chaotic situations. The gold and silver bronze command structure is a system designed to improve communication between ground personnel and the control room. Generally, the bronze commander will be a senior official on the ground to coordinate the work of the emergency center. The silver commander will be located in the "event control room", which is set up to improve communication on site. Another gold commander will enter the control room.

The police are also responsible for condemning minors by issuing citations, which can often lead to fines, especially traffic law violations. Traffic law enforcement is usually effectively carried out by motorcycle police of the mounted police, who call the motorcycles they are on duty motorcycle police for short. Police were also trained to help people in distress, such as drivers whose cars broke down and those in medical emergencies. Police usually receive basic first aid training, such as cardiopulmonary resuscitation.

Some park rangers are appointed law enforcement officers and perform law enforcement tasks in national parks and other remote wilderness and recreation areas, while the gendarmes perform law enforcement functions within the military.