Tex. R. Evid. 615
But art. 39.14 does not entirely eliminate the need for in-trial discovery of witness statements. Art. 39.14 does not extend equivalent discovery rights to the prosecution, and so prosecutors will still need to use Rule 615 to obtain witness statements of defense witnesses. Moreover, some defendants may fail to exercise their discovery rights under art. 39.14 and so may wish to obtain a witness statement under Rule 615. In addition, the Michael Morton Act applies only to the prosecution of offenses committed after December 31, 2013. Defendants on trial for offenses committed before then have no right to pre-trial discovery of the witness statements of prosecution witnesses.
Consequently, Rule 615(a) has been amended to account for the changed pre-trial discovery regime introduced by the Michael Morton Act. If a party's adversary has already produced a witness's statement - whether through formal discovery under art. 39.14 or through more informal means - Rule 615(a) no longer gives a party the right to obtain, after the witness testifies on direct examination, a court order for production of the witness's statement. But if a party's adversary has not already produced a witness's statement, the party may still use Rule 615(a) to request and obtain a court order requiring production of the witness's statement after the witness finishes testifying on direct examination.