Mo. Rev. Stat. § 103.059: Rules authorized, duties of board.

Subject to the limitations of law, the board shall formulate and adopt rules and regulations for the government of its own proceedings and for the administration of the plan, and its decisions as to all questions of fact shall be final and conclusive on all persons except for the right of review as provided by law and except for fraud or such gross mistake of fact as to have an effect equivalent to fraud.