The finance director shall be authorized to issue checks for the following items: postage, express and freight, pay for city employees terminating between regular paydays, payroll adjustments due to preparation errors or omissions, payments to the city fiscal agent for debt service, refunds of overpayments, transmittal of collections on behalf of the state and county, refunds of overpayments made to the city, redemption of warrants, and expenses for special police investigation purposes. Requests for checks must be accompanied by a properly executed request form signed by the department head or the department head's designee requesting the check. Requests for special police investigation funds shall be made only by the chief of police or the chief's designee and must be supported by a properly executed claim signed by the chief or the chief's designee. The finance director shall develop such additional procedures as are necessary for the handling of cash payments.