26 Tex. Admin. Code § 564.6
Providers shall plan, supervise adequately, and evaluate any activity for which they are responsible. Providers shall render services carefully and promptly. Providers shall follow the technical and ethical standards related to the provision of services, strive continually to improve personal competence and quality of service delivery, and discharge their professional responsibility to the best of their abilities. Providers are responsible for assessing the adequacy of their own competence for the responsibility to be assumed. Services shall be designed and administered as to do no harm to recipients. The provider shall always act in the best interest of the individual being served. The provider shall terminate any professional relationship that is not beneficial, or is in any way detrimental, to the individual being served.
26 Tex. Admin. Code § 564.6