Texas Government Code - GOV'T § 418.185. Mandatory Evacuation

(a) This section does not apply to a person who is authorized to be in an evacuated area, including a person who returns to the area under a phased reentry plan or credentialing process under Section 418.050.

(b) A county judge or mayor of a municipality who orders the evacuation of an area stricken or threatened by a disaster by order may compel persons who remain in the evacuated area to leave and authorize the use of reasonable force to remove persons from the area.

(c) The governor and a county judge or mayor of a municipality who orders the evacuation of an area stricken or threatened by a disaster by a concurrent order may compel persons who remain in the evacuated area to leave.

(d) A person is civilly liable to a governmental entity, or a nonprofit agency cooperating with a governmental entity, that conducts a rescue on the person's behalf for the cost of the rescue effort if:

(e) An officer or employee of the state or a political subdivision who issues or is working to carry out a mandatory evacuation order under this section is immune from civil liability for any act or omission within the course and scope of the person's authority under the order.