If shoes, clothing items or other accessories containing metal set off an alarm, the security screener would insist on further checks, including pat-down frisking.
Those figures include passengers being disruptive, intoxicated or confrontational with security screeners, law enforcement officers, airport employees or passengers in airports and on aircraft.
After all, physical security screeners see what's in your bag and your pockets; aerial and digital surveillance sees behavior, and potentially everything else.
Here, motivation of the security screeners is crucial and the airside security checkpoints, due to the isolated position and the low number of accesses, are often a boring business.