Tex. Occ. Code § 157.057
The board may adopt additional methods to implement:
Acts 1999, 76th Leg., ch. 388, Sec. 1, eff. Sept. 1, 1999.
Acts 2013, 83rd Leg., R.S., Ch. 418 (S.B. 406), Sec. 7, eff. November 1, 2013.