An Eagle Scout candidate's service project is being used to assist security measures at Chicago's O'Hare airport:
"[T]he homemade devices in use at O'Hare, and similar ones elsewhere, are an optional, preliminary step to let passengers know whether their shoes will trigger alarms if they don't remove them and send them through the X-ray machines before walking through checkpoints... Inside each box is a wand, or small metal detector, held up with bungee cords. The box sounds an alarm if there's a violation. "
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