Mo. Rev. Stat. § 29.210

Whenever the state auditor conducts an audit of the state highways and transportation commission and the state transportation department, salaries of auditors, examiners, clerks, stenographers and other employees of the state auditor making such audit and all expenses incurred in making such audit shall be paid monthly by the state highways and transportation commission and the state transportation department out of moneys appropriated to the state highways and transportation commission and the state transportation department, when such payrolls and expense accounts for such purposes are certified to the state highways and transportation commission and the state transportation department by the state auditor.