Mo. Rev. Stat. § 547.350: Power of marshal in executing order.

1. The marshal and his deputies, if any, while performing their official duties shall have the same power and like authority in every county of this state, in all respects, as are granted by law to sheriffs.

2. Any person executing a warrant for arrest and transportation issued by the marshal shall have the same power and like authority in all respects when executing the warrant as are granted to sheriffs.

3. The provisions of subsection 1 of this section shall only be applicable to a marshal of the supreme court certified as a peace officer as provided in sections 590.100 to 590.150.