Mo. Rev. Stat. § 150.110: Collector to call on merchants — report violations to grand jury or prosecuting attorney.

It shall be the duty of the several collectors to call at least as often as once in every three months on all merchants who are required by law to take out license, and to offer to furnish such as have not a license, with a license; and the said collector shall report to each grand jury or prosecuting attorney of his county the names and localities of all persons who refuse to take out or renew their license at the proper time as required by law.