The $40 that I paid to have my tint done was nothing compared to the $250 ticket I got because they were too dark!!
Here in TX, the MAX is 15%, and mine were at 20%. The bad news is that I didn't even ask for mine to be 20%, the guy that did my tint thought he was helping me out since I have black leather interior... very helpful huh!!
I didn't know about the "sticker" that you all know about - until the office put the meter on, and told me that the installer knew that they were too dark.
Better luck to y'all...
Jilly-bean