Any person seeking reimbursement for official expenses under this part shall file with the commissioner of finance and administration, or other official with whom the commissioner's duties may be placed by law, a sworn itemized statement for the amounts necessarily expended by such person in the discharge of such official duties, as granted in this part, and upon the receipt of such verified statement, such commissioner shall issue a warrant in the reimbursement of such expenses, payable out of the state treasury.