Mo. Rev. Stat. § 630.164

Any person, official or institution complying with the provisions of section 630.162, in the making of a report, or in cooperating with the department in any of its activities pursuant to sections 630.161 to 630.167, except the person, official, or institution accused of abusing or neglecting the vulnerable person shall be immune from any civil or criminal liability for making such a report, or in cooperating with the department, unless such person acted negligently, recklessly, in bad faith, or with malicious purpose.