I live in Amarillo, TX. You can't even get a ticket for a sticker that says cops suck. I wish I could post a pic of my back window and all of my friends trucks, u'd see what I mean. As far as the law states down here, you just have to have two functioning mirrors and the third is something you don't have to have. Up until a year ago, I could only see out of a 12"x12" section of my back window.
Clint