Well you'd think with the technology there someone would step up and make darker aftermarket glass and we could all have legal tinted windows. But I guess from what everyone's saying it just doesn't happen...
My Bro had tinted windows for about 3 years and they are a lot of trouble with the cops. Sometimes they'd pull him over for just being young in a sports car and then when they realized everything checked out they'd give him the ticket just to not look so dumb.
Also in an outlying rural area we have one cop who everyone calls "The Tint Nazi" and if he ever catches you he'll tow your car or you can take it off with his razor right on the side of the road - this was the fate of my Bro's tint.
