Mo. Rev. Stat. § 537.120: Physician not liable for restraint of mentally incapacitated persons.

No regular practicing or licensed physician or surgeon or the owner or operator of any private sanatorium or hospital shall be liable in damages for restraint of any mentally incapacitated person by reason of having in good faith furnished care, treatment or attention to such person, and while such person is under the care of such physician or surgeon or confined in such sanatorium or hospital.