[bonz]

If I tint my car to x% in a state then move to another where that tint is now "illegally dark" do I get grandfathered due to my tint having gone on legally somewhere else?

 

[bathgate]

No that's not how it works as soon as you move to another state and register your car you need to follow there rules. If what you were saying was the case anybody can do what ever to there car and say I had it like this from another state. The only way you can do that is keep your car registered wherever you live now so you still go by that states laws.