Acts 1985, 69th Leg., ch. 211, Sec. 1, eff. Jan. 1, 1986. Amended by Acts 1991, 72nd Leg., ch. 203, Sec. 1.32; Acts 1991, 72nd Leg., ch. 554, Sec. 1, eff. Sept. 1, 1991; Acts 1997, 75th Leg., ch. 1349, Sec. 43, eff. Sept. 1, 1997; Acts 1999, 76th Leg., ch. 62, Sec. 5.10, eff. Sept. 1, 1999; Acts 2003, 78th Leg., ch. 687, Sec. 1, eff. Sept. 1, 2003. Amended by: Acts 2005, 79th Leg., Ch. 1107 , Sec. 1.21, eff. September 1, 2005. Acts 2007, 80th Leg., R.S., Ch. 501 , Sec. 1, eff. September 1, 2007. Acts 2009, 81st Leg., R.S., Ch. 310 , Sec. 1, eff. September 1, 2009. Acts 2011, 82nd Leg., R.S., Ch. 1318 , Sec. 1, eff. September 1, 2011.