Mo. Rev. Stat. § 537.615
The provisions of this act* increasing the liability of the state and its public entities shall only be applied to those causes of action that accrue on or after January 1, 2000.
(L. 1999 S.B. 295 & 46 § 1)
*"This act" (S.B. 295 & 46, 1999) contained numerous sections. Consult Disposition of Sections table for a definitive listing.