(a) Except as provided by Subsection (b), a licensed nurse or person providing health care services in an out-of-hospital setting may honor a physician's do-not-resuscitate order.
(b) When responding to a call for assistance, emergency medical services personnel:
(1) shall honor only a properly executed or issued out-of-hospital DNR order or prescribed DNR identification device in accordance with this subchapter; and
(2) have no duty to review, examine, interpret, or honor a person's other written directive, including a written directive in the form prescribed by Section 166.033.