Seattle-Tacoma International Airport is scheduled to install its first full-body scanner next month, stirring a local debate over privacy, safety and effectiveness. While a TSA spokesman says the machines are safe and effective, with built-in safeguards for travelers' privacy, they have agreed to make the screening optional. Other airports also warn Seattle may see longer security lines as the new machines are introduced. "There was a learning curve on the part of passengers and TSA personnel," says the operations manager at El Paso International Airport, which got its scanners in June.
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