Mo. Rev. Stat. § 379.1421
The director may promulgate all rules and regulations necessary to effectuate the purposes of sections 379.1353 to 379.1421. No regulations promulgated under this authority shall affect SPLRC contracts or other transactions approved prior to the effective date of such rules. 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 under 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, 2007, shall be invalid and void.
§ 379.1421, RSMo