Actually, all smart assness aside. My only exposure to this was on one trip to the US. I believe I was clearing US customs at Calgary Airport, I was given the option of walking through the scanner or being patted down & told that if I chose the scanner I would have to wait in line, but if got patted down It would take seconds. I decided that I'd rather be that much closer to my destination that much sooner so chose the pat down. It wasn't very intrusive. Further, as I mentioned earlier, that since these people can decide on a whim whether I stay or go, this was pretty much the last hoop that I needed to jump through.