Mo. Rev. Stat. § 630.161

The department of mental health shall investigate incidents and reports of vulnerable person abuse using the procedures established in sections 630.163 to 630.167 and, upon substantiation of the report of vulnerable person abuse, shall promptly report the incident to the appropriate law enforcement agency and prosecutor. If the department is unable to substantiate whether abuse occurred due to the failure of the operator or any of the operator's agents or employees to cooperate with the investigation, the incident shall be promptly reported to appropriate law enforcement agencies.