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Forensic evidence. Swab sample about to be placed inside its container. The container will prevent the sample from becoming contaminated. In the background is a police evidence bag. If a person is arrested by the police, they must supply a saliva sample. From this a DNA (deoxyribonucleic acid) profile can be formed and compared to profiles already held on the National DNA Database (NDNAD). The NDNAD was set up by the Forensic Science Service in 1995.
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