States have laws restricting the amount of tint allowed for the front windows..In Texas it is 25%Go 18% on the front door windows as it matches the rear. When you see the PoPo cruising by, just open the sunroof slider and bam, you have 35% tint.
If I was a policeman and I could not see the driver because of dark tint it would make me nervous approaching the vehicle..And I do not want a nervous cop approaching me.It seems that in my state there aren't enough police on the roads to enforce traffic laws (speeding, careless driving, etc.) so even though I'm not tinting my windows, I wouldn't worry about it. I see cars with front windows tinted so dark you can't see into the vehicle.