The scans sparked controversy when introduced in airports nationwide in 2010. Privacy groups, in chorus with Muslim religious groups around the world, decried the images as an offensive invasion of privacy. Similarly, the rigorous pat-downs, available to passengers who choose to opt out of the scans, have been criticized as invasive and humiliating. Facing a pat-down, software engineer John Tyner famously told a TSA agent, "If you touch my junk, I'll have you arrested," launching the "Don't touch my junk" meme around the TSA's security apparatus.

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