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| | Police |
 | | Although the Ministry of Defense Police, Atomic Energy Authority Constabulary and the Police Service of Northern Ireland (aka Royal Ulster Constabulary) are issued firearms as a matter of routine, as are the many detectives of CID and Special Branch and plainclothes constables of the Flying Squad and the National Crime Squad. |
 | | Specialised groups exist within the branches either for dealing with particular types of crime (for instance, traffic policing, murder, or fraud) or because of particular specialised skills they have (for instance, diving, operating helicopters, bomb squad, and so on). |
 | | In most Western legal systems, the major role of the police is to discourage and investigate crimes, and if able to apprehend suspected perpetrator(s), to detain them, and inform the appropriate authorities. |
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