[rplst8]

> for example if a $50 device beeps whenever there's an explosive (it sniffs the air as passengers walk past it) then it can prevent unknown attacks and I'm sure you would agree that it should be installed rather than "accept" that passengers will always bring explosives on planes.

Of course. Passive detection of illegal substances is fine by me. But making me partially disrobe, manual searches of by bags, and prevention from travel if I do not submit to the coercion is wrong and a violation of everyone's rights. A "bomb" detector is no different from a smoke detector. It's not a search (as long as it isn't also used to identify people by smell and track their movements).