Mo. Rev. Stat. § 544.200
Current with changes from the 2023 Legislative Session
To make an arrest in criminal actions, the officer may break open any outer or inner door or window of a dwelling house or other building, or any other enclosure, if, after notice of his office and purpose, he be refused admittance.
§ 544.200, RSMo
RSMo 1939 § 3889