Tex. Loc. Gov't Code § 270.005
(a) The commissioners court of a county with a population of 251,000 to 280,000 may contract with the United States government or a federal agency for:
Acts 1987, 70th Leg., ch. 149, Sec. 1, eff. Sept. 1, 1987.
Amended by Acts 1991, 72nd Leg., ch. 597, Sec. 95, eff. Sept. 1, 1991;
Acts 2001, 77th Leg., ch. 669, Sec. 80, 81, eff. Sept. 1, 2001.