How Window Tinting Laws Work?

I'm getting my windows tinted this week. I travel between three states frequently; Florida, Ohio, and SC. The three states have different tinting laws. My question is, does my tint have to be in line with all three states or just the state my car is registered in?How Window Tinting Laws Work?
I would think it would go by what state your car is licensed in. Alot of states require you to have both a front and rear license plate. I just drove from michigan to florida and back and i know a couple of those states have that law and in michigan you only need a rear plate and i didnt have any problem. But like the other person said i wouldnt be surprised if a cop stops you just to give you a hard time and look for other things to hit you withHow Window Tinting Laws Work?
In theory, I don't know.

In practice, it had better be or you can expect to be harassed in the states where your tinting does not comply.How Window Tinting Laws Work?
The cops have a million dollar gauge. Laws mean nothing to them. If the million dollar gauge says its to dark, then its to dark. You will be found guilty in a court of law and face up to a $5000 fine and 6 months in a correctional facility.
The State the vehicle is registered in.