Mo. Rev. Stat. § 37.730: Immunity from liability, when.

1. Any employee or an unpaid volunteer of the office shall be treated as a representative of the office. No representative of the office shall be held liable for good faith performance of his or her official duties under the provisions of sections 37.700 to 37.730 and such representative shall be immune from suit for the good faith performance of such duties. Every representative of the office shall be considered a state employee under section 105.711.

2. No reprisal or retaliatory action shall be taken against any recipient or employee of the departments or courts for any communication made or information given to the office. Any person who knowingly or willfully violates the provisions of this subsection is guilty of a class A misdemeanor.