That would be an argument in favor of the airport scanners instead of metal detectors, which I'm not sure is a good direction.
I'm also not sure how many guns are ceramic.
I'm also not sure how many guns are ceramic.
none
there is at least one.
guns made entirely of plastic are also viable.
and there is no fully plastic gun, even polymer striker-fired guns have metal components (notably, barrel, slide)
please provide links