Its main purposes are: The case of R v. Khan (1996), which was heard by the House of Lords,[2] was one on the factors leading to the regulation of police powers embodied in this legislation.

[3] The function of the NCIS was to gather and analyse intelligence data in order to provide insight and intelligence to national police forces.

Its role was later taken over by the Serious Organised Crime Agency.

[4] The Criminal Records Bureau, now known as the Disclosure and Barring Service, was established under Part V of the Police Act 1997 and was launched in March 2002.

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