Tex. Elec. Code § 13.141
The secretary of state shall prescribe a uniform system for assigning voter registration numbers.
Acts 1985, 69th Leg., ch. 211, Sec. 1, eff. Jan. 1, 1986.
Acts 2005, 79th Leg., Ch. 1105 (H.B. 2280), Sec. 2, eff. January 1, 2006.