Tex. Nat. Res. Code § 161.116
Acts 1977, 65th Leg., p. 2659, ch. 871, art. I, Sec. 1, eff. Sept. 1, 1977.
Amended by Acts 1993, 73rd Leg., ch. 242, Sec. 1.07, eff. Aug. 30, 1993;
Acts 1993, 73rd Leg., ch. 300, Sec. 36, eff. Aug. 30, 1993;
Acts 2001, 77th Leg., ch. 620, Sec. 1, eff. Sept. 1, 2001.