Tex. Gov't Code § 843.102
(a) A member is eligible to receive service credit in the retirement system for prior service if the member became a member as an employee of a subdivision:
Acts 1981, 67th Leg., p. 1876, ch. 453, Sec. 1, eff. Sept. 1, 1981. Renumbered from Vernon's Ann.Civ.St. Title 110B, Sec. 53.102 and amended by Acts 1989, 71st Leg., ch. 179, Sec. 1, eff. Sept. 1, 1989.
Amended by Acts 1991, 72nd Leg., ch. 460, Sec. 5, eff. Jan. 1, 1992;
Acts 2003, 78th Leg., ch. 621, Sec. 11, eff. Jan. 1, 2004.
Acts 2007, 80th Leg., R.S., Ch. 873 (H.B. 1587), Sec. 17, eff. January 1, 2008.