A former resident of this state is eligible to vote a presidential ballot in the presidential general election by personal appearance or by mail if the former resident:
(1) is domiciled in another state;
(2) was registered to vote in this state at the time the former resident ceased to be a resident;
(3) would be eligible for registration to vote in this state if a resident; and
(4) on presidential election day will not have resided in the state of present domicile for more than 30 days and is not eligible to vote in the presidential election in that state.
Official text of the Texas Election Code as published by the Texas Legislative Council.