Ill. Admin. Code tit. 20, § 1232.230
d) The required signs shall be clearly and conspicuously posted, as required by Sections 5-20 and 5-50 of the Act, on the premises where the certified licensee conducts business.
1) The sign required by Section 5-20 of the Act shall advise persons that it is unlawful:
Sections 5-20 and 5-50 of the Act specify warning language that must be posted.