22 Tex. Admin. Code § 213.12
A witness who is not a party to the proceeding and who is subpoenaed to appear at a deposition or hearing or to produce books, papers, or other objects, shall be entitled to receive reimbursement for expenses incurred in complying with the subpoena as set by the legislature in the APA, Texas Government Code Annotated §2001.103.
Source Note:The provisions of this §213.12 adopted to be effective August 15, 2002, 27 TexReg 7107.