Tex. Health and Safety Code § 13.037: DETERMINATION OF RESIDENCY.

(a) A person is a resident of this state if the person:

(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.

(b) The intent to make a home in this state may be demonstrated by proof similar to or including:

(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.

Acts 1989, 71st Leg., ch. 678, Sec. 1, eff. Sept. 1, 1989.