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, either the minimum as set by the legislature in the APA or the State of Texas Travel Allowance Guide issued by the Comptroller of Public Accounts, whichever is greater.
Source Note:The provisions of this §213.12 adopted to be effective September 1, 1998, 23 TexReg 6444.