Missouri Revised Statutes Title XL. Additional Executive Departments § 630.183. Officers may authorize medical treatment for patient

(1) Upon consent of a patient or resident who is competent;

(2) Upon consent of a parent or legal guardian of a patient or resident who is a minor or legally incapacitated;

(3) Pursuant to the provisions of chapter 431;

(4) Pursuant to an order of a court of competent jurisdiction.