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Scanners go online: Body scanners were activated in U.S. airports in nine cities this week, part of heightened security measures deployed after a Nigerian man attempted to detonate a bomb in a Detroit-bound airline on Christmas Day. The scanners allow security officials to see beneath a passenger’s clothing to search for nonmetallic explosives or contraband. Under the current rules, passengers can refuse to be scanned, but if they do, they have to pass through a metal detector and submit to a pat-down by a security agent. The Transportation Security Administration plans to install about 900 scanners in U.S. airports by 2014. While some advocates have raised privacy concerns, a recent poll found that 78 percent of Americans approved of the security measure.

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