Some Illinois cities are now trying to supercede state law and put their own limitations on tinted car windows.
The current law in Illinois states that car windows can be tinted down to 35% meaning 35% sunlight is coming through the tint.
"We did extensive testing with the Illinois State Police and other law enforcement agencies in Springfield and simulated night time stops. They came to us with these recommendations that are current statutes and said, this is what we like," said Steve Williams, owner Williams Enterprises.
But not all cities are following state laws. Chicago has banned tinted windows, in part, to protect police.
When approaching a car with dark window tint officers say it's hard to see inside; whether a person is hiding contraband, weapons, or even driving without wearing a seatbelt.
Local car tinters say it's an issue more and more police are starting to pay attention to.
"We have people here in Illinois and in this region that come in and they'll have tickets for tint that is too dark of a value. So, it's not just in Chicago it's all over Illinois. If you're past the legal limit, they're probably going to get you," said Nathan Keller with Armadillon Audio.
If you're caught with a tint above legal standards you could be facing a fine of at least $120.
The bill that would exempt all local ordinances or "home rules" is now sitting on the governor's desk.
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