Mo. Rev. Stat. § 263.470
263.470 Prohibition, Johnson grass extermination area.
263.470. Prohibition, Johnson grass extermination area. — No county may elect to declare itself a Johnson grass extermination area pursuant to sections 263.255 to 263.267 , after August 28, 1992.
(L. 1992 H.B. 1199 § 11)