In some states, it may be legal to cover the fixed rear window with a blackout film. Blackout film is a type of window tint that is designed to block out light. However, it is important to note that blackout film can also make it difficult for you to see out of the rear window, which can be a safety hazard.
If you are considering covering the fixed rear window of your car, it is important to be aware of the laws in your state. Additionally, you should consider the safety implications of covering the rear window.