Mo. Rev. Stat. § 57.295

In each county of this state the sheriff and each full-time deputy sheriff shall receive, at the discretion of the county commission, twenty-five dollars per month, as a uniform allowance, and may receive, at the discretion of the county commission, not in excess of a total of one hundred dollars per month, as a uniform allowance, to be paid to him or her monthly out of the county treasury. This allowance shall apply only to sheriffs and deputy sheriffs who wear an official uniform in performance of their duty.