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Great idea--simple, inexpensive, highly effective when considered relative to its small cost.

Therefore I never expect to see this in a US airport.

"inexpensive"

Just wait until TSA vendors out the development of it :)

Case in point, TSA paid $47,000 for an app that randomly chose for a passenger to go left or right.

$1.4M

$47,400

Thanks for my newest startup idea!