Two-Witness Rule Law and Legal Definition

Two-witness rule refers to the rule that supports a perjury conviction. Under this rule, two independent witnesses must establish that the alleged perjurer gave false testimony. In the U.S. Constitution, it is stated that no person may be convicted of treason without two witnesses to the same over act.

In Cramer v. United States, 325 U.S. 1 (U.S. 1945), it was held that under the two-witness rule, the uncorrobated oath of one witness is not enough to establish the falsity of the testimony of the accused in a perjury prosecution.