Texas Health and Safety Code - HEALTH & SAFETY § 13.037. Determination of Residency

(1) is physically present and living voluntarily in this state;

(2) intends to make a home in this state;  and

(3) is not in this state temporarily.

(1) the possession of documentation, such as a Texas driver's license, motor vehicle registration, or voter registration certificate;

(2) the presence of personal effects at a specific abode in this state;  or

(3) employment in this state.