Within the vernacular of counter-terrorism agents and police officers, a cleanskin is an undercover operative whose identity is not known to the forces he or she is tasked to infiltrate. This is usually because such an agent has not conducted any prior undercover activity.

The phrase entered wide currency with a slightly different meaning in the United Kingdom following the London bombings of 7 July 2005. The four bombers involved in those bombings were reported in the press to be "cleanskins", according to police sources, meaning that their profiles did not fit the expected profile of bombers.

Terrorist organizations, smugglers, and others performing secretive activities prefer to subvert cleanskins as there is less chance that they will arouse suspicion. For example, a person with previous convictions for importing drugs is more likely to be detained than a person never convicted.

The word cleanskin originally comes from Australia, and refers to an unbranded cattle (or maverick), with the earliest references being around the 1860s. The word then evolved to mean a person against whom no conviction has been recorded, a person who was 'clean'.

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