I just got my windows tinted to the legal specs I have found. I live in IL, I got 20% on back windows, and back windshield, then I got 35% on the front windows, and a 6 inch strip that is also 35%. I spoke with a sherrif today (about my tints, and a parking ticket I got) and he said its perfect because I didnt get a ticket for it. He says thats excatly the legal limit. So those are the laws the sherif's go by!