Ill. Admin. Code tit. 68, § 1370.230
a) An applicant, licensee or registrant who believes he or she has a therapeutic reason to use a substance described in Section 1370.220(d) may request a therapeutic use exemption (TUE) to permit continued use of that substance. Such a request may only be granted by the Division. The applicant or licensee shall submit the request in writing to the Division. The request shall be accompanied by supporting medical information sufficient to allow the Division to determine whether to grant the request. In reaching its decision, the Division will, at a minimum, determine whether all of the following criteria have been met: