Check local laws, there is something in NJ (which allows exactly 0 tint up front), that if you have a prescription from an optometrist (eye doctor right? Its 2 am), it is legal and you cannot receive a ticket for it. (Disclaimer, I AM NOT A LAWYER. do your own research)
Hope this helps.
http://www.andyswindowtint.com/State-of-NJ-Tinting-Laws.php