Mo. Rev. Stat. § 210.1263: Background checks required, when.

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.