Missouri Revised Statutes Title XXII. Occupations and Professions § 338.155. Immunity from civil liability, when

1. Any person who in good faith and without malice reports, provides information, or cooperates in any manner with the board, or assists the board in any manner including, but not limited to, any applicant or licensee, whether or not the applicant or licensee is the subject of an investigation, record custodians, consultants, attorneys, board members, agents, employees, staff or expert witnesses, in the course of any investigation, hearing or other proceeding conducted by or before the board pursuant to the provisions of this chapter shall not be subject to an action for civil damages as a result of providing such information and cooperating with the board.

2. No physician or other authorized prescriber who, in good faith, cooperates with the board by writing a prescription or drug order at the request of the board pursuant to a routine inspection or a lawful investigation shall, by virtue of that cooperation, be in violation of this chapter or any drug laws of this state and shall be acting as an agent of the state and, as such, shall have sovereign immunity for those actions.

3. No licensee, registrant, permit holder, or other individual or entity subject to the board's jurisdiction who, in good faith, fills a prescription presented by the board as part of an inspection or investigation shall, by virtue of that act, be in violation of this chapter or the drug laws of this state, provided the prescription is otherwise prepared and dispensed in a lawful manner.