Mo. Rev. Stat. § 469.901: Trustee duties, settlor may restrict or expand.

1. Except as otherwise provided in subsection 2 of this section, or by other applicable laws, a trustee who invests and manages trust assets owes a duty to the beneficiaries of the trust to comply with the prudent investor rule set forth in this act*.

2. A settlor may expand or restrict the prudent investor rule detailed in this act* by express provisions in the trust instrument. A trustee is not liable to a beneficiary for the trustee's good faith reliance on these express provisions.