Unless the physician has reason to believe the physician assistant or advanced practice registered nurse lacked the competency to perform the act, a physician is not liable for an act of a physician assistant or advanced practice registered nurse solely because the physician signed a standing medical order, a standing delegation order, or another order or protocol, or entered into a prescriptive authority agreement, authorizing the physician assistant or advanced practice registered nurse to administer, provide, prescribe, or order a drug or device.
Tex. Occ. Code § 157.060