Tex. Gov't Code § 572.052
(a) A member of the legislature may not, for compensation, represent another person before a state agency in the executive branch of state government unless the representation:
Added by Acts 1993, 73rd Leg., ch. 268, Sec. 1, eff. Sept. 1, 1993.
Amended by Acts 1997, 75th Leg., ch. 1134, Sec. 15, eff. Sept. 1, 1997;
Acts 2003, 78th Leg., ch. 249, Sec. 5.07, eff. Sept. 1, 2003.