Mo. Rev. Stat. § 142.953
Any rule or portion of a rule, as that term is defined in section 536.010, that is promulgated under the authority delegated in this chapter shall become effective only if it has been promulgated pursuant to the provisions of chapter 536. All rulemaking authority under this chapter delegated prior to January 1, 1999, is of no force and effect and repealed; however, nothing in this section shall be interpreted to repeal or affect the validity of any rule filed or adopted prior to January 1, 1999, if it fully complied with the provisions of chapter 536. 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 January 1, 1999, shall be invalid and void.
§ 142.953, RSMo
Effective 1/1/1999