Judicial_estoppel
In the common law, judicial estoppel (also known as estoppel by inconsistent positions) is an estoppel that precludes a party from taking a position in a case that is contrary to a position it has taken in earlier legal proceedings. Although, in the United States, it is only a part of common law and therefore not sharply defined, it is generally agreed that it can only be cited if the party in question successfully maintained its position in the earlier proceedings and benefited from it.