Mo. Rev. Stat. § 280.080
All treated timber being sold or offered for sale within the state shall be accompanied by an invoice which shall carry the following information in addition to the price, terms of sale and other information required by the purchaser:
(L. 1961 p. 40 § 2.2, A.L. 1965 p. 95, A.L. 1979 S.B. 36, A.L. 1984 H.B. 863)
Effective 1-01-85