50 ILCS 150/20

Before an expense for travel, meals, or lodging may be approved under Section 15 of this Act, the following minimum documentation must first be submitted, in writing, to the governing board or corporate authorities: (1) an estimate of the cost of travel, meals, or lodging if expenses have not been incurred or a receipt of the cost of the travel, meals, or lodging if the expenses have already been incurred; (2) the name of the individual who received or is requesting the travel, meal, or lodging expense; (3) the job title or office of the individual who received or is requesting the travel, meal, or lodging expense; and (4) the date or dates and nature of the official business in which the travel, meal, or lodging expense was or will be expended. All documents and information submitted under this Section are public records subject to disclosure under the Freedom of Information Act.