The initials for deoxyribonucleic acid, the molecular code of human life. As with fingerprints, each person possesses a unique chromosomal identity based on hereditary characteristics. DNA can be found in each living cell including blood, sperm, skin and hair follicles. DNA testing can result in absolute proof as to the existence of a physical presence at a crime scene. DNA testing is getting less expensive and is being used with more frequency to exonerate questionable convictions of defendants that were charged and convicted with serious crimes.

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