<p style="margin: 0px;">Window tint laws vary from state to state. I think that in general, if you are passing through a state, the local constables won't mess with you too much.</p><p style="margin: 0px;"> </p><p style="margin: 0px;"> </p><p style="margin: 0px;">Iowa can be pretty nasty about the tinted thing - at least where the front windows are concerned. If an Iowa resident, they will give a $127.50 ticket for window tint on the front windows. Even if from out of state, many cops will pull a person over just to see what's going on (drug activity, etc.). If you are from this state, there's practically no mercy on the ticket thing. It's easy revenue with virtually no chance for dismissal. They even carry "light meters" in the squad cars to measure visible light.</p><p style="margin: 0px;"> </p><p style="margin: 0px;">In this state 70% of the light must pass through the front and side windows. This is for both the safety of law enforcement (when approaching you) as well as to help a driver see bikers, walkers, other cars, etc. Back side windows and the back windshield can be tinted as dark as desired.</p><p style="margin: 0px;"> </p><p style="margin: 0px;">I was surprised that in Iowa, you don't have to see out the back windshield if driving a van. As long as you have side mirrors you're okay... I have the back windows blacked out with magnets and blackout curtains (Walmart).</p>