Mo. Rev. Stat. § 170.225
170.225 Rules, procedure.
170.225. Rules, procedure. — No rule or portion of a rule promulgated under the authority of this chapter shall become effective unless it has been promulgated pursuant to the provisions of section 536.024 .
(L. 1977 H.B. 130 § 1 as that number appears for the second time in H.B. 130, A.L. 1981 S.B. 200, A.L. 1995 S.B. 3)