Well trained bomb sniffing dogs deployed on the entrance ramps of departing airline flights would make it much harder to sneak explosives on board.
Roving K-9 explosive detection teams are a great deal less expensive than millimeter wave machines and add a powerful human component.
Terrorists could never be exactly sure what the dogs would sniff and would tend to give themselves away with nervousness and / or with covering odors.
Coupled with politically incorrect profiling and some common sense - how many international travelers check no bags - K-9 explosive searches are a relatively inexpensive, effective solution that could be deployed fairly quickly.
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