Mo. Rev. Stat. § 335.209
No rule or portion of a rule promulgated under the authority of sections 335.200 to 335.209 shall become effective unless it has been promulgated pursuant to the provisions of section 536.024.
(L. 1990 H.B. 1429 § 4, A.L. 1993 S.B. 52, A.L. 1995 S.B. 3)