Acts 1965, 59th Leg., vol. 2, p. 317, ch. 722. Amended by Acts 1973, 63rd Leg., p. 978, ch. 399, Sec. 2(C), eff. Jan. 1, 1974.

Amended by:

Acts 2011, 82nd Leg., R.S., Ch. 68 (S.B. 934), Sec. 1, eff. September 1, 2011.