Legal immigrants are issued status papers and/or green cards.
The rest of us have to show a driver's license or a facimile that they can obtain if they don't drive.
All this law is doing is asking people to show an I.D.
There is no plan to just run around & ask people if they are illegal. If they are arrested or stopped for good cause, like anyone else - they will be asked for their I.D.
What is so wrong with that?
A lot of people don’t carry an ID with them when they are not driving.