Acts 1965, 59th Leg., vol. 2, p. 317, ch. 722. Amended by Acts 1971, 62nd Leg., p. 3046, ch. 1006, Sec. 1, eff. Aug. 30, 1971.

Amended by:

Acts 2011, 82nd Leg., R.S., Ch. 736 (H.B. 1070), Sec. 3, eff. June 17, 2011.