Mo. Rev. Stat. § 413.145
Except as otherwise provided in sections 413.005 to 413.229 or by regulations promulgated thereunder, any package whether a random or a standard package, kept for the purpose of sale, or offer or exposure for sale, shall bear on the outside of the package a definite, plain, and conspicuous declaration of:
(L. 1983 H.B. 729, A.L. 1994 S.B. 729, A.L. 2002 S.B. 1071)