105 ILCS 5/34-84a
Subject to the limitations of all policies established or adopted under Section 14-8.05, teachers, other certificated educational employees, and any other person, whether or not a certificated employee, providing a related service for or with respect to a student shall maintain discipline in the schools, including school grounds which are owned or leased by the board and used for school purposes and activities. In all matters relating to the discipline in and conduct of the schools and the school children, they stand in the relation of parents and guardians to the pupils. This relationship shall extend to all activities connected with the school program, including all athletic and extracurricular programs, and may be exercised at any time for the safety and supervision of the pupils in the absence of their parents or guardians.
Nothing in this Section affects the power of the board to establish rules with respect to discipline, except that the rules of the board must provide, subject to the limitations of all policies established or adopted under Section 14-8.05, that a teacher, other certificated employee, and any other person, whether or not a certificated employee, providing a related service for or with respect to a student may use reasonable force as needed to maintain safety for the other students, shall provide that a teacher may remove a student from the classroom for disruptive behavior, and must include provisions which provide due process to students.
105 ILCS 5/34-84a