Tex. Elec. Code § 114.002
A United States citizen dwelling outside the United States is eligible to vote a federal ballot by mail if:
Acts 1985, 69th Leg., ch. 211, Sec. 1, eff. Jan. 1, 1986.
Amended by Acts 1991, 72nd Leg., ch. 203, Sec. 2.30;
Acts 1991, 72nd Leg., ch. 554, Sec. 1, eff. Sept. 1, 1991.