Added by Acts 1993, 73rd Leg., ch. 886, Sec. 16, eff. Jan. 1, 1995. Amended by Acts 1999, 76th Leg., ch. 62, Sec. 3.08, eff. Sept. 1, 1999; Acts 1999, 76th Leg., ch. 1236, Sec. 4, eff. Aug. 30, 1999.