Turn state's evidence

To turn state's evidence is for an accused or convicted criminal to testify as a witness for the state against his associates or accomplices. Turning state's evidence is occasionally a result of a change of heart or feelings of guilt, but more often is done in response to a generous offer from the prosecution, such as a reduced sentence or a favorable location for serving time. In particularly high-profile or dangerous cases such as organized crime trials including other federal crimes trials, the witness may be offered immunity from prosecution even if he has committed serious crimes himself, up to and including murder. The state may also offer the witness a place in the witness protection program, giving them a new identity so they need not fear retaliation from their former accomplices.