Mo. Rev. Stat. § 327.111
Any person who practices architecture in Missouri as defined in section 327.091, who is not exempt pursuant to the provisions of section 327.101, or who is not the holder of a currently valid license or certificate of authority to practice architecture in Missouri, or who pretends or attempts to use as such person's own the license or certificate of authority or the seal of another architect or who affixes his or her or another's architect's seal on any plans, specifications, drawings, or reports which have not been prepared by such person or under such person's immediate personal supervision, is guilty of a class A misdemeanor.
(L. 1969 S.B. 117, A.L. 1981 S.B. 16, A.L. 1999 H.B. 343)