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Airline passengers in the United States understand they will be treated as suspected terrorists when going through airport security checkpoints. Yet nearly a decade after the Sept. 11, 2001 terror attacks, airport security has become a lot more invasive with the rollout of the so-called "advanced imaging technology" scanners, paid for with $1 billion in stimulus funds. The scanners - now deployed at about 78 airports - use either millimeter wave or backscatter technology to create a virtual picture of the traveler's naked body. The image is then viewed by a screener  with the Transportation Security Agency iin a sequestered room away from the checkpoint.