lol, yes they are, but cops arent gonna bother with it unless they really need to write a ticket.

I got pulled over in Forsythe County by a cop who said I swirved which was BS. Because he couldnt get me on anything he made it a point to say "Those license plate covers are illegal to use, even though its not illegal to buy them."

That was the only time a cop said something about it to me, even though I've been pulled over a couple of times.