Mo. Rev. Stat. § 199.240: Consent required for medical or surgical treatment.

No person committed to a facility designated by the department of health and senior services under sections 199.170 to 199.350 shall be required to submit to medical or surgical treatment without such person's consent, or, if incapacitated, without the consent of his or her legal guardian, or, if a minor, without the consent of a parent or next of kin, unless authorized by a written order of the circuit court under section 199.200 or as otherwise permitted by law.