Tex. Health and Safety Code § 161.011: PERMISSION REQUIRED.

A person, including an officer or agent of this state or of an instrumentality or political subdivision of this state, may not enter a private residence to conduct a health inspection without first receiving:

(1) permission obtained from a lawful adult occupant of the residence; or

(2) an authorization to inspect the residence for a specific public health purpose by a magistrate or by an order of a court of competent jurisdiction on a showing of a probable violation of a state health law, a control measure under Chapter 81, or a health ordinance of a political subdivision.

Acts 1989, 71st Leg., ch. 678, Sec. 1, eff. Sept. 1, 1989. Amended by Acts 2003, 78th Leg., ch. 198, Sec. 2.189, eff. Sept. 1, 2003.