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Is High-Tech Security at Public Events Counterproductive?

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Bomb-sniffing dog

Bomb-sniffing dogs and other trained canines might be the best option for improving security at public events like the Boston Marathon.

Credit: U.S. Army

Which is more intrusive: security screening and metal detectors every few blocks, or a drone flying high above it taking video of every little thing you do?

From Scientific American
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