Mo. Rev. Stat. § 532.150
Current with changes from the 2023 Legislative Session
If the person upon whom the writ ought to be served conceal himself or refuse admittance to the person attempting the service thereof, it may be served by affixing the same in some conspicuous place on the outside either of his dwelling house or of the place where the party is confined.
§ 532.150, RSMo
RSMo 1939 § 1601