20 ILCS 405/405-536
Any State-owned building that requires the display of a State-issued identification card for the purpose of gaining access to the premises shall, in addition to other acceptable forms of identification, accept the use of any Illinois municipal identification card as an acceptable form of identification for the purpose of entering the premises. An Illinois municipal identification card may not be sufficient to access certain secure areas within the premises and may require additional authorization or identification at the discretion of the premises' security, the Department of Central Management Services, or the user agency.
For the purposes of this Section, "municipal identification card" means a photo identification card that is issued by an Illinois municipality, as defined under Section 1-1-2 of the Illinois Municipal Code, in accordance with its ordinances or codes that consists of the photo, name, and address of the card holder.
20 ILCS 405/405-536