Mo. Rev. Stat. § 210.1263

Officers, managers, contractors, volunteers with access to children, employees, and other support staff of residential care facilities subject to the notification requirements under sections 210.1250 to 210.1286; any person eighteen years of age or older who resides at or on the property of such residential care facility; any person who has unsupervised contact with a resident of such residential care facility; and owners of such residential care facilities who will have access to the facilities shall undergo background checks under section 210.493.