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.
ive had that tint meter machine on my window 3 seperate times
'04 Chevy Silverado LT 4x4 - intake, headers, full exhaust, zo6 cam, 799 heads, tune, leveled, 33's '00 Grand Prix GTP DAYTONA 500 - L36 block, S1X, intercooled, GenV, N*, headers, full exhaust, coilovers, 5 speed swap, stage 3+ clutch