Mo. Rev. Stat. § 57.095: Service of process, immunity from liability for sheriffs and law enforcement officers, when.

Notwithstanding the provisions of section 537.600 to the contrary, sheriffs or any other law enforcement officers shall have immunity from any liability, civil or criminal, while conducting service of process at the direction of any court to the extent that the officers' actions do not violate clearly established statutory or constitutional rights of which a reasonable person would have known.