Mo. Rev. Stat. § 84.640: Police force — power to make arrests.

The members of the police force of any such city are hereby empowered to make arrests for the violation of any ordinance of such city for the protection, regulation and orderly government of parks, public grounds and other public property owned by any such city and situated outside of the limits thereof, and persons so arrested for the violation of any such ordinance may be brought within the city limits and tried before any court having jurisdiction of cases arising out of the ordinances of such city.