No they really don't. Got pulled over in a ford escort because they claimed my stock tint was way too dark. The officer pulled out a machine that slides onto a car window & gauges tint. I was very sick that night & wasn't the driver. I thought to puke on him but it didn't happen.

I've been pulled over at least a dozen times for underglow on 2 different cars. It's legal(ish) here in Wichita.