55 ILCS 5/3-10005.3

The treasurer may maintain the following special funds from which the county board shall authorize payment by voucher between board meetings: (a) Overpayments. (b) Reasonable amount needed during the succeeding accounting period to pay office expenses, postage, freight, express or similar charges. (c) Fund to pay necessary travel, dues and other expenses incurred in attending workshops, educational seminars and organizational meetings established for the purpose of providing in-service training. (d) Trust funds for such purposes as may be provided for by law. (e) Such other funds as may be authorized by the county board. The treasurer shall make accounting monthly to the county board through the county clerk of all special funds maintained by him in the discharge of his duties.