At common law, a party calling a witness could not attack the credibility of his own witness. This was called the:

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The Voucher Rule at common law prevented a party who called a witness from impeaching (attacking) the credibility of their own witness. This rule was based on the principle that by calling a witness, a party vouched for the credibility of that witness and thus could not later claim that the witness was not credible.

At Common Law, a Party Calling a Witness Could Not