105 ILCS 5/24-25

Teachers and other employees may request any person entering a public school building or the grounds which are owned or leased by the board and used for school purposes and activities to identify himself and the purpose of his entry. A person who refuses to provide such information is guilty of a Class A misdemeanor.

Authorized agents of an exclusive bargaining representative, upon notifying the school office, may meet with school employees in the school building during duty free times of such employees.