Mo. Rev. Stat. § 375.923
Exempt forms.
375.923. Exempt forms. — All forms on file with the director on or before January 1, 1980, shall be exempt from the provisions of sections 375.920 to 375.923 .
(L. 1979 S.B. 276 & 277 § 4, A.L. 2008 S.B. 788)