Mo. Rev. Stat. § 474.560
1. Any written estate planning document may be executed electronically, and no such estate planning document shall be invalid or void solely because it is in electronic form or because it is signed electronically by a settlor, trustee, principal, grantor, declarant, or owner, or by a witness to any such person's signature. For purposes of this section, "estate planning document" shall include, but not be limited to:
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(L. 2025 H.B. 754)