Acts 1965, 59th Leg., vol. 2, p. 317, ch. 722. Amended by Acts 1971, 62nd Leg., p. 2990, ch. 987, Sec. 3, eff. June 15, 1971.

Amended by:

Acts 2007, 80th Leg., R.S., Ch. 1263 (H.B. 3060), Sec. 10, eff. September 1, 2007.