Acts 1977, 65th Leg., p. 2385, ch. 871, art. I, Sec. 1, eff. Sept. 1, 1977. Amended by Acts 1989, 71st Leg., ch. 1145, Sec. 1, eff. Sept. 1, 1989; Acts 1991, 72nd Leg., ch. 295, Sec. 34, eff. June 7, 1991; Acts 1995, 74th Leg., ch. 76, Sec. 11.263, eff. Sept. 1, 1995; Acts 1995, 74th Leg., ch. 165, Sec. 22(52), eff. Sept. 1, 1995; Acts 1995, 74th Leg., ch. 416, Sec. 2, eff. June 8, 1995; Acts 2001, 77th Leg., ch. 70, Sec. 1, eff. Sept. 1, 2001. Amended by: Acts 2011, 82nd Leg., R.S., Ch. 96 , Sec. 4, eff. September 1, 2011. Acts 2011, 82nd Leg., R.S., Ch. 96 , Sec. 5, eff. September 1, 2011. Acts 2011, 82nd Leg., R.S., Ch. 96 , Sec. 6, eff. September 1, 2011. Acts 2011, 82nd Leg., R.S., Ch. 96 , Sec. 19(2), eff. September 1, 2011.