105 ILCS 5/5-20

Examination of books, securities and effects - Accounts and vouchers. At each regular meeting, and at such other meetings as they may think proper, the trustees of schools shall examine all books, notes, mortgages, securities, papers, moneys and effects of the corporation, and the accounts and vouchers of the township treasurer or other township school officer, and shall make such order for their security, preservation, collection, correction of errors, if any, and for their proper disposition, as may be necessary.