Here's an idea:
Instead of scanning people one-by-one to see if they're packing a bomb, why not instead sniff them a dozen at a time?
Then - if a sensitive sniffer senses a certain amount of PPM of any chemical associated with explosives, those people get closer scrutiny: either a thorough pat-down or a visual scanners.
It would be faster and expose more people to less radiation and fewer gropings.
All the TSA would need is a supplier of er um... let's say 15 x 15' sealed rooms with vacuum-sniffers to detect volatile chems' associated with explosives at the PPM level in a few minutes.
IS THIS POSSIBLE? FEASIBLE? PATENTABLE?
Lemme know in comments...