> How do you know they don't have a button to push to make it give a false positive so they can hold people? I've never been in the US, but when I travel (Eur

> How do you know they don't have a button to push to make it give a false positive so they can hold people? I've never been in the US, but when I travel (Europe, MENA), I am always chosen by airport security, even in my own country when leaving, for an additional search (less annoying than a TSA patdown I read of, but still), and when I asked recently why is it always me, a guy answered I was randomly selected by the gate. Got to start buying lottery tickets.