2.  Collaborative practice arrangements, which shall be in writing, may delegate to a registered professional nurse the authority to administer, dispense or prescribe drugs and provide treatment if the registered professional nurse is an advanced practice registered nurse as defined in subdivision (2) of section 335.016.  Collaborative practice arrangements may delegate to an advanced practice registered nurse, as defined in section 335.016, the authority to administer, dispense, or prescribe controlled substances listed in Schedules III, IV, and V of section 195.017, and Schedule II - hydrocodone; except that, the collaborative practice arrangement shall not delegate the authority to administer any controlled substances listed in Schedules III, IV, and V of section 195.017, or Schedule II - hydrocodone for the purpose of inducing sedation or general anesthesia for therapeutic, diagnostic, or surgical procedures.  Schedule III narcotic controlled substance and Schedule II - hydrocodone prescriptions shall be limited to a one hundred twenty-hour supply without refill.  Such collaborative practice arrangements shall be in the form of written agreements, jointly agreed-upon protocols or standing orders for the delivery of health care services.  An advanced practice registered nurse may prescribe buprenorphine for up to a thirty-day supply without refill for patients receiving medication-assisted treatment for substance use disorders under the direction of the collaborating physician. see full law