By the Act, Congress exercised its power to define the rules that should govern this particular area in the trial of criminal cases instead of leaving the matter of lawmaking to the courts. The Act, and not the Supreme Court decision in the
Jencks case, governs the production of statements of government witnesses in a federal criminal trial. The Jencks Act is constitutional as an exercise of congressional power to prescribe rules of procedure for the
federal courts. In some instances however, the statute may be overridden by an accused's constitutional right to disclosure of
exculpatory evidence. The Jencks Act governs production of statements and reports of prosecution witnesses during federal criminal trials. The Act provides that in any criminal prosecution brought by the United States, no statement or report in the possession of the United States which was made by a government witness or prospective government witness (other than the defendant) shall be the subject of
subpoena,
discovery or inspection
until the witness called by the United States has testified on direct examination in the trial of the case. After testimony of the witness, called by the government on
direct examination, the court must, on motion of the defendant, order the United States to produce any statement of the witness in the possession of the government. If the entire contents of any such statement relate to the subject matter of the testimony of the witness, the court shall order it to be delivered directly to the defendant for his examination and use.
Definition Under the Jencks Act, a "statement" of a prosecution witness is: • A written statement made by the witness and signed or otherwise adopted or approved by him; • A stenographic, mechanical, electrical or other recording, or a transcription of it, which is substantially verbatim recital of an oral statement made by the witness to an agent of the Government and recorded contemporaneously with the making of such oral statement; or • A statement, however taken or recorded, or a transcription of it, made by the witness to a grand jury. If the government does not deliver a witness's Jencks statement to the defendant, the court may strike the witness's testimony or declare a mistrial. The Jencks Act has been characterized as intending to assure defendants of their right to confront their accusers under the
Sixth Amendment. Its provisions are not a constitutional mandate. Its requirements do not rise to constitutional stature. The
Confrontation Clause of the Sixth Amendment is not necessarily violated by the government's failure to produce Jencks Act material, but may be violated by preventing the ability to confront government witnesses. ==Brady material==