I have used them in the past and nothing was ever said about it. I have not seen them in some time. I would not mind having some myself. If nothing else, they would be good to put on the windows when you are parked to help keep the truck cooler in all this heat. The only thing that I know that is illegal is the dark tint. You may be able to go to the fmcsa website and find the answer to you question.

you need to find a window tint that blocks the UV rays but that meets the spec for visibility.

My doctor expressed some concern about how dark my left arm is getting.

Long sleeve shirt and AC, or sunscreen. As far as I know those are both still DOT legal.

i know you all won't beleive it. but your going to have a very hard time finding any type of tint that blocks only 10 percent light.

your window already blocks 20 percent. jsut roll down your windoe a little enough to see the difference above and below the window line.

as a retired auto mechanic that did state safety inspections. the light meter showed 18 - 22 percent WITHOUT any added tint to the window. on any given car.

i don't think such a window exists that doesn't block any type of light. in other words, ZERO PERCENT.

tint used to be a big time seller. been a long time since i seen any shops selling it though. simply for the fact that they don't sell any tint light enough to not go over the limits when added to the window.

I tried explaning that to my safety director. I'm not sure he was convinced.

10 seconds with Google found me this:

http://www.snaptint.com/product.php?productid=16192

a clear window tint that blocks UV rays.

Of course you would need to be qualified to operate scissors or another sharp type of instrument to install!