Mo. Rev. Stat. § 80.410
Current with changes from the 2023 Legislative Session
The town marshal shall be chief of police, and shall at all times have power to make or order all arrests, with proper process, for any offenses against the laws of the state, or of the town, by day or by night, and bring the offender to trial before the proper court, and he shall have power to arrest without process in all cases where any such offense shall be committed, or attempted to be committed, in his presence.
§ 80.410, RSMo
RSMo 1939 § 7278