Mo. Rev. Stat. § 621.198
The administrative hearing commission shall publish and file with the secretary of state rules of procedure for the conduct of proceedings before it. Rules of procedure adopted pursuant to this section shall be designed to simplify the maintenance of actions and to enable review to be sought, where appropriate, without the need to be represented by independent counsel. Any rule or portion of a rule, as that term is defined in section 536.010, that is created under the authority delegated in this section shall become effective only if it complies with and is subject to all of the provisions of chapter 536 and, if applicable, section 536.028. This section and chapter 536 are nonseverable and if any of the powers vested with the general assembly pursuant to chapter 536 to review, to delay the effective date or to disapprove and annul a rule are subsequently held unconstitutional, then the grant of rulemaking authority and any rule proposed or adopted after August 28, 2001, shall be invalid and void.
§ 621.198, RSMo