I can tell you this I have my windows tinted for years, every car I own I go ahead and tint them(at my 9th car now) and no I have yet not gotten any documentation to have them permitted, it all honestly depends on the police and the location. Let’s start off with this If your going to tint your windows and are afraid of the policy stopping you, then Do not Do them, there is no point, I have owned a vehicle with just rear tints at 5% and still pulled over because I had no amber turn single bulb, and yes IE to see if my vehicle was carrying any substances or was illegal, I had another vehicle that I did tint all the way around except the front windshield, the sides where “legal limit” around 30% and the rears where 5% and still got pulled over for dumb stuff, license plate bracket was obstructing plates, little dumb stuff like that, Now I currently am 5% all the way around with ceramic tint(can see threw them better at night) and 50% on front windshield and every now and then I would get harassed and tailgated by police Just the other day, me and my girl where driving tandem down the street, she’s also 5% all around (16 wrx) same plate bracket we have in our cars, and I’m behind her in my 12 Civic si(5% all around,no front window tint) and I was the one who got tailgated untill we reached our Home! Again it’s all up to your personal preference, my girlfriend can drive any where and have minimum to no issues, me on the other hand, I feel like because I drive a Honda, they tend to keep an eye for us more Again if your going to do it, go all in or don’t do it at all, make sure your vehicle is straight on paperwork and don’t carry anything illegal. This is just my preference and what I have felt with up Northern NJ