110 ILCS 20/4

If no proof of immunization, certification of medical exemption or statement of religious objection from an enrolled student is in the possession of the post-secondary educational institution, the person shall be precluded from registering in a subsequent term or semester until such time as the appropriate documentation is presented to the institution. The institution shall not be liable for any monetary loss on the part of a student precluded from registering for failure to comply with the provisions of this Act.