Mo. Rev. Stat. § 52.300
Collectors may appoint deputies and assistants, by an instrument in writing, duly signed, and may also revoke any such appointment at their pleasure. Each such deputy or assistant shall have like authority, in every respect, to collect the taxes levied or assessed within the portion of the county, town, district or city assigned to such deputy or assistant, which, by law, is vested in the collector; but each collector shall, in every respect, be responsible to the state, county, towns, cities, districts and individuals, companies, corporations, as the case may be, for all moneys collected, and for every act done by any deputy or assistant when acting as a deputy or assistant, and for any omission of duty of such deputy or assistant. Before entering upon the duties for which they are employed, deputies and assistants shall give bond and security to the satisfaction of the collector. The bond for each individual deputy or assistant shall not exceed one-half of the amount of the maximum bond required for any collector pursuant to sections 52.020 to 52.100. The official bond required pursuant to this section shall be a surety bond with a surety company authorized to do business in this state. The premium of the bond shall be paid by the county or city being protected. Any bond or security taken from a deputy or assistant by a collector, pursuant to this chapter, shall be available to such collector or the collector's representatives and sureties, to indemnify them for any loss or damage accruing from any act of such deputy.
§ 52.300, RSMo