105 ILCS 5/27-1005: General permissive education.

No school or school board is required to administer any curriculum or instruction contained in the following Sections of this Article. The curriculum and instruction contained in the following Sections of this Article are entirely permissive. However, if a school or school board chooses to administer the curriculum or instruction in any of the following Sections of this Article, then the school or school board shall follow all requirements listed in the appropriate Section. The State Board of Education shall abide by all requirements of each of the following Sections of this Article.