Mo. Rev. Stat. § 56.320: Fees paid to county treasury (first class counties).

In all counties of class one the salary of the prosecuting attorney is in lieu of all fees for criminal cases, but the fees of the prosecuting attorney shall continue to be taxed as heretofore, and, when collected, shall be turned into the treasury of the county. All fees of the prosecuting attorney in criminal cases not paid by the state shall be collected by the clerk of the circuit court of the county and by him paid into the treasury of the county. When the fees are paid by the state, they shall be paid into the county treasury in the manner now provided by law.