That's what some guy told me tonight while I was at work because I am getting 35% (legal limit in al is 32) all the way around and he told me he has 5% on his impala on the back window and back side panel windows. He said he had 5 all the way around and scraped the 5% off the front windows and the guy that inspected it said it was good. So is it legal to put whatever on the back window?