Mo. Rev. Stat. § 67.136: Municipal courts, utilization of collection agencies permitted, when.

Notwithstanding any other provisions of law to the contrary, any city or county that has established a municipal court may utilize collections agencies to collect any court or administrative fines or costs associated with a finding of guilt for a criminal offense or an infraction, or entry of a civil judgment, which are legally owed, enforceable, past due, and remain uncollected.