Acts 1965, 59th Leg., vol. 2, p. 317, ch. 722. Amended by Acts 1973, 63rd Leg., p. 984, ch. 399, Sec. 2(E), eff. Jan. 1, 1974.

Amended by:

Acts 2005, 79th Leg., Ch. 1026 (H.B. 1048), Sec. 2, eff. September 1, 2005.