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Generally, polygraph evidence is not admissible in federal court. There are some appellate courts which have allowed it under certain circumstances. For instance, the Eleventh Circuit held that polygraph results are admissible (1) when the parties stipulate to admissibility in advance of the test; or (2) when the polygraph results are used to impeach or corroborate the testimony of a witness. In the latter circumstance, the party seeking to introduce the polygraph results must provide adequate notice to the opposing party; the opposing party must be given adequate opportunity to have its own polygraph expert administer a test covering substantially the same questions; and the evidence must be admissible under the rules governing corroboration or impeachment. The 11th Circuit did make this decision though until 1989.