35% all around on cars is the law in MD, but you have to take into account that you already have some tint on your windows. All cars with AC do. So compounded you could end up with 20-30 depending on the car.
VA is 50 on the front and 35 on the back. Again compounded by factory tint.
Most of the time if you get tint installed around the legal limit, most cops don't bother because it's negligable based on their meter. It also has a lot to do with how you act towards the cop. If you are very compliant and curtious, you likely get of with little or nothing. Cop and attitude and they'll likely screw you.
Interior color has a lot to do with it too. Light interiors take a darker tint to look dark and can more easily be caught being too dark. Dark interiors look darker and aren't as obviously too dark to cops.
Windows Tint Laws 
