Originally Posted by
estnet
Maybe this is too simple but electronic chemical detectors and dogs would be a better (more accurate) and faster, never mind, lower cost screening for explosives!
Oh I forgot, logic doesn't apply

Dogs and robots are not paid a normal salary under workfare programs aimed at people. Since the TSA and TSA-approved screening requirements are government-peddled workfare programs aimed at employment of people, dogs and machines are not a primary interest.
Since dogs and machines don't care about being employed as part of a workfare program and don't vote as if their or their favorite's livelihood counted on the workfare programs continuing, it's understandable that this seems to be about people before dogs.
Seriously, your suggestion would make sense but the employment model of the TSA doesn't support it.