Tint laws vary WIDELY by state. The (legal) tint my wife got in Dallas was totally illegal in California and for the first couple of years even a medical waiver wasn't sufficient, fortunately they changed that law.

Anyway, there are a bunch of places on the net that break the laws down by individual state, here's one which ought to be up to date, but don't hold me to it:

http://www.iwfa.com/iwfa/Law_Chart/S...aw%20Chart.htm