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A police officer is a warranted employee of a police service. Among the responsibilities of a police officer are to maintain public order, prevent and detect crime and apprehend offenders, using force when necessary. Police officers can be trained in an enormous number of specialisms such as armed response, hostage negotiation, royalty or diplomatic protection, surveillance, counter-terrorism, child protection, internet-based sexual offences, major criminal investigations such as fraud, rape, murder, honour killings, people or drugs trafficking and so on.