What's the difference between backscatter machines and millimeter wave scanners?

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Author's Note: What's the difference between backscatter machines and millimeter wave scanners?

I'm not against absorbing a few X-rays in the interest of staying safe at 30,000 feet, but I can't help but wonder why the TSA insists on using backscatter machines when millimeter wave scanners deliver the same intelligence without potentially harmful ionizing rays. Didn't the government learn anything from the Beta/VHS wars?

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