Acts 1965, 59th Leg., vol. 2, p. 317, ch. 722.

Amended by Acts 1981, 67th Leg., p. 802, ch. 291, Sec. 102, eff. Sept. 1, 1981.

Amended by:

Acts 2011, 82nd Leg., R.S., Ch. 1324 (S.B. 480), Sec. 1, eff. June 17, 2011.