Mo. Rev. Stat. § 476.310: No judge or clerk to have partner — exception.

No judge, clerk or deputy clerk of any court shall have any partner practicing in the court in which he is a judge, clerk or deputy clerk, except that the partner of a municipal judge who is not a full-time judge may practice in other divisions of the circuit court if such practice does not involve municipal ordinance violation cases arising from a municipality which is served by such municipal judge.