Window film laws vary from state to state, and country to country. Many countries allow window film on the entire car as long as they meet certain light transmission standards. In the U.S., window film is not permitted on the front windshield but allowed on the side windows and back windshield. The amount of allowable light transmission varies depending on state laws. Talk with your Madico® window film dealer to ensure you’re within legal boundaries or check out these window film rules and laws per state, courtesy of the International Window Film Association (IWFA).