Tex. Gov't Code § 660.041
(c) A state employee may not be reimbursed for mileage incurred in traveling between the employee's residence and place of employment in a personally owned or leased motor vehicle unless the travel:
Added by Acts 1993, 73rd Leg., ch. 268, Sec. 1, eff. Sept. 1, 1993.
Amended by Acts 1997, 75th Leg., ch. 1300, Sec. 9, eff. Sept. 1, 1997;
Acts 1999, 76th Leg., ch. 280, Sec. 4, eff. Sept. 1, 1999.