Tex. Elec. Code § 174.068
The state executive committee may adopt rules concerning voting procedures for any party convention. If the state executive committee fails to adopt rules:
Acts 1985, 69th Leg., ch. 211, Sec. 1, eff. Jan. 1, 1986.
Acts 2013, 83rd Leg., R.S., Ch. 1054 (H.B. 3102), Sec. 23, eff. June 14, 2013.