Full-body scanners face mounting criticism on a variety of fronts, USA TODAY reports. Frequent fliers complain that the machines are slow and inefficient, civil libertarians say they violate privacy, and some scientists worry about radiation levels. Meanwhile, the Government Accountability Office has said it remains unconvinced that the scanners will significantly improve aviation security. The TSA, however, says it continues to be "highly confident" in the technology and notes that travelers who object may choose another screening method.
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