Qui tam
In common law, a writ of qui tam is a writ through which private individuals who assist a prosecution can receive for themselves all or part of the damages or financial penalties recovered by the government as a result of the prosecution. Its name is an abbreviation of the Latin phrase qui tam pro domino rege quam pro se ipso in hac parte sequitur, meaning "someone pursues in this matter for the lord king as well as for himself." The writ fell into disuse in England and Wales following the Common Informers Act 1951 but remains current in the United States under the False Claims Act, 31 U.S.C. § 3729 et seq., which allows a private individual, or "whistleblower" (or relator), with knowledge of past or present fraud committed against the federal government to bring suit on its behalf.