Tinted tail lights are a popular car modification, but many people don't know if they're legal. In Texas, it is actually illegal to have any kind of tint on your tail lights. This includes smoked, blacked out, or any other type of tint that would reduce the light output or make the brake lights less visible. The only exception to this rule is if your car came from the factory with tinted tail lights. Other than that, you'll need to remove any aftermarket tints before driving in Texas.