Mo. Rev. Stat. § 256.640
Rules, procedure.
256.640. 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. 1985 S.B. 281 § 14, A.L. 1993 S.B. 52, A.L. 1995 S.B. 3)