Mo. Rev. Stat. § 103.138
103.138 Plan not responsible for liabilities prior to effective date — for ...
103.138. Plan not responsible for liabilities prior to effective date — for participating agencies and political subdivisions. — The plan shall not assume responsibility for any liabilities incurred by the participating member agency or its eligible employees, retirees, or dependents prior to its effective date.
(L. 1992 H.B. 1574 § 4 subsec. 4)