The Criminal Investigation Department (CID) is the branch of all Territorial police forces within the British Police and many other Commonwealth police forces, to which plain clothes detectives belong. It is thus distinct from the Uniformed Branch and the Special Branch. The Metropolitan Police Service CID, the first such organisation, was set up on 7 April 1878 by C. E. Howard Vincent. Originally, it was under the direct command of the Home Secretary, but since 1888 has been under the authority of the Commissioner.

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