Turn state's evidence
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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 is more often 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 and other federal crimes trials, witnesses may be offered immunity from prosecution even if they have committed serious crimes themselves, sometimes even 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.
In India (and historically in the British Isles) the term turning approver is used for someone giving full disclosure about a crime in return for pardon under Sections 306 to 308 of the Code of Criminal Procedure, 1973, though the term is not used in the Code itself.
|Witness||Testified against||Charge(s)||Received for testimony|
|Salvatore "Sammy The Bull" Gravano, mob hit man||John Gotti||Racketeering||Witness protection, after 5 years in prison|
|Frank "Curly" Lino of the Bonanno crime family||Ron Filocomo||Murder of Sonny Black Napolitano||?|
|"Easy Eddie" O'Hare, mobster||Al Capone||Tax evasion||According to some sources,[according to whom?] his son Butch's admission to the U.S. Naval Academy in Annapolis|
|Harry Orchard, mass murderer||William "Big Bill" Haywood||Assassination of former governor of Idaho Frank Steunenberg||?|
|James Leibrant, accessory to murder||Karla Faye Tucker||Murder of Jerry Lynn Dean and Deborah Thornton||Full immunity|
|James Jordan, Klansman and accessory to murder||18 other Klansmen including Neshoba County deputy Cecil Price||Murder of three civil rights workers||Full immunity, $3500 and help in relocating himself and his family|
|Christie's auction house||Sotheby's||Commission rate-fixing||Protection from criminal prosecution (for the business—
however the former chairmen of both companies were indicted)
|Linda Kasabian, driver of the getaway car in the Tate/LaBianca murders||Charles Manson and other members of the Manson Family||Multiple murders||Immunity from prosecution|
|James "Dick" Liddil, bank robber, murderer and member of the James-Younger gang||Jesse James||Robbery and murder||immunity from prosecution|
|Daniel Tucker Bassham, member of the James-Younger gang||William "Whiskey Head" Ryan, member of the James-Younger gang||Robbery and murder||10-year sentence commuted, released from Missouri State Penitentiary|
|Wayne DuMond, rapist||Various acquaintances||Murder||Pardoned by Gov. Mike Huckabee|
|John Dean||Richard Nixon and others||Watergate||1–4 years in prison. Served in a "safe house" at Fort Holabird|
|Robert Rozier, murderer and cult member||Hulon Mitchell, Jr. (Yahweh ben Yahweh), cult leader||Murder and racketeering||Reduced sentence|
|David Greenglass, spy, passed information about the Manhattan Project to...||...Julius and Ethel Rosenberg||Treason, espionage||Immunity for his wife, who served as his courier|
|Henry Hill, mobster||Paul Vario and Jimmy Burke||Racketeering charges||Immunity from prosecution and Witness Protection for Hill and his family|
|Abe "Kid Twist" Reles, Mafia hit man||Louis "Lepke" Buchalter, members of Murder, Inc.||Murder||No death penalty|
|William Hare, the West Port murders in Edinburgh, Scotland||William Burke||Murder||Immunity from prosecution|
|Joseph Massino, Bonanno crime boss||No death penalty|
- Plea bargain
- Pentito, the equivalent term in Italy in the Mafia and terrorism contexts
- Caporegime, the equivalent term in the Mafia for Captain.
- Pomeroy, John Norton (1876). "State's Evidence". In Barnard, Frederick A. P. Johnson's new universal cyclopædia a scientific and popular treasury of useful knowledge. New York; Pittsburg, Pa.: A. J. Johnson & son. p. 495‒496. Retrieved 22 May 2013.
- Maas, Peter. Underboss: Sammy the Bull Gravano's Story of Life in the Mafia. New York, N.Y.: HarperPaperbacks. ISBN 0-06-109664-4.