Tex. Alcoholic Beverage Code § 5.441

(a) If a member of the commission, the administrator, or an employee of the commission is called to attend a federal or state judicial proceeding inside or outside the state and the attendance relates to the individual's duties with the commission, the individual shall pay to the comptroller any witness fees he receives. The comptroller shall deposit the fees in the state treasury to the credit of an appropriation made to the commission for payment of fees and mileage of witnesses called by the commission.

(b) An employee of the commission who travels inside or outside the state on official business as the designated representative of the administrator is entitled to reimbursement for meals, lodging, and travel at the same rate as is applicable to members of the commission.