Source on where to find updated rental discrimination rules

[Nolan Mahoney]

Hello, future landlord here. So i live in Illinois and i am looking to house hack and ive been re reading managing rental properties and im trying to find out what counts as discrimination when it comes to the new SOI rule in IL. So basicaly i cant find out where they get their income from but can see if they have a job and contact their employer to verify they work there? or can i not ask if they have a job or a legal source of income at all? Also ive heard talk of you cannot discriminate against someone who is a non legal U.S. Citizen from renting from me? 

I would like to try and find the specifics to these question online but no luck so far. Anything helps, Thanks!