Tex. Gov't Code § 2001.091
(a) On the motion of a party, on notice to each other party, and subject to limitations of the kind provided for discovery under the Texas Rules of Civil Procedure, a state agency in which a contested case is pending may order a party:
(1) to produce and to permit the party making the motion or a person on behalf of that party to inspect and to copy or photograph a designated document, paper, book, account, letter, photograph, or tangible thing in the party's possession, custody, or control that:
(b) An order under this section:
Added by Acts 1993, 73rd Leg., ch. 268, Sec. 1, eff. Sept. 1, 1993.