Look to the way Israel does security in their airports. You don't see body scanners, just highly trained security staff from the curb outside the airport, so the ticket agent, to baggage screening to security checkpoints. Israel has at least 7 layers of security, but they pride themselves on speeding travelers through the entire process in under 20 minutes. And they have been secure for several decades now with no bombs, no hijackings, nothing. It all comes from monitoring the crowd for 'behavioral irregularities'.
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