I tinted all the window in my Smart, including the front windshield. I love it. I used metal film and it really makes a difference. The only problem is the tint would stick to the frit on the roof glass (I removed the headliner). I have never had an issue with the police as far as the windshield tint goes. It is basically clear except it has metal in it that reflects the sun.
Andy Tobias
Tobias' Automotive
Cave Creek, AZ