The physician assistant shall use a written agreement that outlines the patient's responsibilities for opioid therapy. This written agreement for treatment must include the following provisions:

(1) The patient's agreement to provide samples for biological specimen testing when requested by the physician assistant;

(2) The patient's agreement to take medications at the dose and frequency prescribed with a specific protocol for lost prescriptions and early refills;

(3) Reasons for which opioid therapy may be discontinued;

(4) The requirement that all opioid prescriptions for chronic pain are provided by a single prescriber or a single clinic, except as provided in WAC 246-918-915 for episodic care;

(5) The requirement that all opioid prescriptions for chronic pain are to be dispensed by a single pharmacy or pharmacy system whenever possible;

(6) The patient's agreement to not abuse alcohol or use other medically unauthorized substances;

(7) A violation of the agreement may result in a tapering or discontinuation of the prescription; and

(8) The patient's responsibility to safeguard all medications and keep them in a secure location.