Missouri Revised Statutes Title XXXVII. Criminal Procedure § 542.412. Contents may be used as evidence, when--disclosure of additional evidence to defendant

1. The contents of any intercepted wire communications or evidence derived therefrom shall not be received in evidence or otherwise disclosed in any trial, hearing, or other proceeding in federal or state court nor in any administrative proceeding unless each party, in compliance with supreme court rules relating to discovery in criminal cases, hearings and proceedings, has been furnished with a copy of the court order and accompanying application under which the interception was authorized or approved and a transcript of any intercepted wire communication or evidence derived therefrom.

2. If the defense in its request designates material or information not in the possession or control of the state, but which is, in fact, in the possession or control of other governmental personnel, the state shall use diligence and make good faith efforts to cause such materials to be made available to the defendant's counsel, and if the state's efforts are unsuccessful and such material or other governmental personnel are subject to the jurisdiction of the court, the court, upon request, shall issue suitable subpoenas or orders to cause such material or information to be made available to the state for disclosure to the defense.