By the most remarkable coincidence, I learned something about my home state this week, courtesy of a city police person
Iowa has the most stringent anti-tint statutes of any state in the union. I've been driving my pickup, bought used, for a year when I was pulled over by a local PD. Being an innocent person
I inquired what had brought me to his attention. Whereupon he said that under Iowa Code, tinted windows on the driver and passenger sides of any motor vehicle must pass 70% of light: essentially they can be no darker than any OEM tinted windshield. "Eyebrow" tints darker than that are not allowed, and effective 7/3/2012, no new medical exemption for eye photosensitivity will be allowed
Existing medical exemptions will be honored until such time as the individual with the doctor statement sells/trades the vehicle, at which time the vehicle must be brought into compliance (ie: strip the tinting from the side windows).
I had actually thought I wouldn't lose any sleep over it as I'd driven the vehicle for a year and never been stopped and thought maybe it was just one of the local enforcement "favorites". And I thought (being a retired LEO myself) that if push came to shove and it went to court, how could an officer determine whether 70% of light was passing through the tint without some light meter?
But when I spoke with my car dealership, it turned out the service manager had an unpleasant encounter with an Iowa highway patrolman who gave him 48 hours to get the vehicle in compliance. Further research showed that NO aftermarket tint supplier makes a tint that passes 70% of light. So all any officer would have to prove in court was that the vehicle had aftermarket window tint on the driver and/or passenger windows (rear seat and rear windows are exempt from the statute). Each tinted window constitutes a violation.
What does this cautionary tale have to do with non-Iowans? Simply this: out of state registered vehicles are NOT EXEMPT from enforcement action
So three days ago I contributed $164.37 to my Chevy dealer's body shop in return for the 2 hours it took them to remove the aftermarket tint and associated adhesive from the driver and passenger windows. But hey, it's Christmas....
So if you're traveling the fair state of Iowa...