Tex. Health and Safety Code § 166.153: PERSONS WHO MAY NOT EXERCISE AUTHORITY OF AGENT.

A person may not exercise the authority of an agent while the person serves as:

(1) the principal's health care provider;

(2) an employee of the principal's health care provider unless the person is a relative of the principal;

(3) the principal's residential care provider; or

(4) an employee of the principal's residential care provider unless the person is a relative of the principal.

Added by Acts 1991, 72nd Leg., ch. 16, Sec. 3.02(a), eff. Aug. 26, 1991. Renumbered from Civil Practice & Remedies Code Sec. 135.003 by Acts 1999, 76th Leg., ch. 450, Sec. 1.05, eff. Sept. 1, 1999.