I think yes, in trucks and SUVs. Do a search. EvasiveEF9 posted a big thing about it a while back, and it quotes the law word-for-word. Search for posts by him.

However, I DO know that no matter what...if your back windows came that way from the factory, they are legal. Just as long as it's not what they call a "film" tint. "Factory" is usually a smoked glass...not a film that goes over it.