Mo. Rev. Stat. § 414.043
After July 1*, 2005, no gasoline sold, offered for sale, or stored within this state shall contain more than one-half of one percent by volume of methyl tertiary butyl ether (MTBE).
(L. 2002 H.B. 1348 merged with S.B. 984 & 985)
*Words "July 31" appear in original rolls of S.B. 984 & 985.