Mo. Rev. Stat. § 137.286
Notwithstanding any other law to the contrary, taxing districts or political subdivisions which first levied an ad valorem property tax pursuant to an election held in April, 1985, or in June, 1985, shall base tax levies on the property valuations established in 1985 and shall not roll back rates based on a tax rate ceiling calculated on 1984 property valuations.
(L. 1987 H.B. 909 § 1)
Effective 7-13-87