Mo. Rev. Stat. § 461.009
Nonprobate transfers are effective with or without consideration, and are not to be considered testamentary or subject to section 473.087, (dealing with the requirement to probate a will), and section 474.320, (dealing with will form, execution and attestation).
(L. 1989 H.B. 145 § 19, A.L. 1995 S.B. 116)