Mo. Rev. Stat. § 478.230

A municipal judge may hear and determine municipal ordinance violation cases of the municipality or municipalities making provision for the particular municipal judge. The provisions of this section authorizing the hearing and determination of particular cases or classes of cases by municipal judges shall be subject to the transfer, assignment, and disqualification provisions contained in Article V of the Constitution, in provisions of law, or in court rules which are authorized by the constitution or by law.