Grounds for search AFTER the checkpoint
... what are they?
I can see:
1. administrative search, carried out by TSA or cops, limited exclusively to the minimum necessary to detect weapons or explosives, because they have reason to believe they may have missed something at the checkpoint
2. US territory entry/exit search, carried out by CBP, to do whatever the hell they want
3. police search, carried out by cops, in the usual Terry stop / incident to arrest / consensual trichotomy that applies outside of airports
Is there something else?