Yep. The first time was a state trooper, he told me he saw me drive by with tint and anything other than factory is illegal. I know I wasn't speeding because it's a weird spot in my hometown that they changed the speeding zones in and I always go 5-10 under. I couldn't say what the laws are in Iowa, but I'm guessing he had the right since it was noticeably illegal. The second time I got pulled over was for my factory tint-I had already taken the tint off, that time he said, "oh well, you were speeding too", but never told me how much I was speeding or gave me any warnings
I'm guessing it's different in Iowa because my fiance got pulled over in his '72 Monte for tint and he wasn't speeding or anything.