Front-side windows must have 70% light transmission or more. Back side windows and rear window may have any tint darkness.

There is a lot of variance on window tint laws from state to state. Here are the ones that allow the most and least tint, and a few things to keep in mind.

The rear window follows a similar process ... Following is a transcript of the video. Narrator: Car windows are tinted for a variety of reasons, like privacy, style, safety, or UV protection.