Tex. Nat. Res. Code § 34.002
(a) The provisions of this chapter apply to:
Acts 1977, 65th Leg., p. 2394, ch. 871, art. I, Sec. 1, eff. Sept. 1, 1977.
Amended by Acts 1981, 67th Leg., p. 2572, ch. 686, Sec. 1, eff. Aug. 31, 1981;
Acts 1985, 69th Leg., ch. 327, Sec. 1, eff. June 8, 1985;
Acts 1985, 69th Leg., ch. 624, Sec. 25, eff. Sept. 1, 1985;
Acts 1987, 70th Leg., ch. 167, Sec. 6.05(d), eff. Sept. 1, 1987.
Acts 2009, 81st Leg., R.S., Ch. 87 (S.B. 1969), Sec. 25.131, eff. September 1, 2009.
Acts 2011, 82nd Leg., R.S., Ch. 502 (H.B. 1449), Sec. 1, eff. June 17, 2011.