The department shall remain fully accountable for the Clinic Revolving Fund. All disbursements shall be substantiated by vouchers filed with the Controller. Disbursements may be reported, substantiated by vouchers, from time to time to the Controller in connection with claims for reimbursements of the revolving fund. At any time, upon the demand of the Department of Finance or the Controller, the revolving fund shall be accounted for and substantiated by vouchers and itemized statements submitted to the Controller.