Mo. Rev. Stat. § 486.375
Any person who acts as, or otherwise willfully impersonates, a notary public while not lawfully appointed and commissioned to perform notarial acts is guilty of a misdemeanor and punishable upon conviction by a fine not exceeding five hundred dollars or by imprisonment for not more than six months or both, unless such act results in a fraudulent act involving property, such person shall be guilty of a class E felony.
(L. 1977 H.B. 513 § 37, A.L. 2016 S.B. 932)