I have a myoelectric prosthetic arm, that always holds me up at the TSA line. I have even taken it off in line and sent it through with my laptop. That doesn't help, I found. After the guy on the other side of the scanner asked me (the only dude standing in line with one hand coming out his sleeves) "Is this your arm?" (boy, it was all I could do to not point to the guy behind me and say "no, I think it's his"), he made me go stand aside while he x-rayed it again and dusted it for explosives, then dusted me for explosives, and after I'd cleared the first metal detector get scanned and groped as if I hadn't cleared the first scan. I was not amused. Another time, in Atlanta, I left the thing on when I went through the scanner. The fact that it was electric so flummoxed the TSA there that they x-rayed it with it still attached to my body from several different angles, causing me to have to stand in all sorts of strange angles to accommodate their stupidity. I told them several times I could remove it, but they insisted I keep it on. Then when the x-rays showed that the electronic hand had WIRES AND BATTERIES, they freaked out and called their boss over to have a look. It was freaking amazing that they didn't turn blue and pass out for forgetting how to breath without illustrated instructions.