105 ILCS 5/10-22.29b
As a supplement to a particular course of instruction, to conduct educational tours, within or without the district, the State of Illinois or the United States, for the pupils or employees, or both, of any school or schools within the district. Nothing in this Section authorizes the use of any school funds for any expenditures incurred on such a tour such as meals, lodging and transportation costs nor does this Section apply to any outdoor education class, field trip or travel to and from a school sponsored event as permitted under Sections 10-22.29, 29-3.1 and 34-18, subsection (11). Nothing in this Section prohibits payment of the salaries of necessary personnel while on a tour or field trip if the personnel are performing in the ordinary course of their employment.
105 ILCS 5/10-22.29b