Mo. Rev. Stat. § 544.560: Sheriff may set conditions for release, when.

When any sheriff or other officer shall arrest a party by virtue of a warrant upon an indictment, or shall have a person in custody under a warrant of commitment on account of failing to find conditions for release as provided in section 544.455, and the conditions for release required are specified on the warrant, or if the case is a misdemeanor, such officer may set the conditions for release, and discharge the person so held from actual custody.