Other violations included committing fraud, mishandling evidence, shop-lifting and making unauthorised use of the FBI database to search for information on friends and family.

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There was overwhelming support for the idea of police taking DNA samples from people charged with sex offences or murder, but less than half wanted samples taken from people convicted of drink-driving or shop-lifting.

BBC: Genetic data 'insurance fear'

In one task, volunteers were exposed to one of three stressful situations (threat of unemployment, a shop-lifting accusation or an incident in a nursing home), where they had to prepare a verbal response and argue their case in front of a camera.

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