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A criminal turns state's evidence by admitting guilt and testifying as a witness for the state against their associate(s) or accomplice(s), often in exchange for leniency in sentencing or immunity from prosecution. The testimony of a witness who testifies against co-conspirator(s) may be important evidence.
According to a 2008 United Nations Office on Drugs and Crime document, persons who turn state's evidence "are known by a variety of names, including cooperating witnesses, crown witnesses, snitches, witness collaborators, justice collaborators, state witnesses, "supergrasses" and pentiti (Italian for 'those who have repented')."