Georgia has just recently passed a window tintng law that requires less than 35% obstruction on non-factory tinted windows and is enforcing it with up to $1000.00 fine:

http://www.wtoctv.com/Global/story.asp?S=3424705

I don't agree or dissagree with it, just wanted folks to know and be aware.
You might want to check with (at least) your surrounding states in case you might ever want to visiit there.