It turns out that their airport scanners cause cancer:

On Sept. 23, 1998, a panel of radiation safety experts gathered at a Hilton hotel in Maryland to evaluate a new device that could detect hidden weapons and contraband. The machine, known as the Secure 1000, beamed X-rays at people to see underneath their clothing.

One after another, the experts convened by the Food and Drug Administration raised questions about the machine because it violated a longstanding principle in radiation safety — that humans shouldn’t be X-rayed unless there is a medical benefit.

“I think this is really a slippery slope,” said Jill Lipoti, who was the director of New Jersey’s radiation protection program. The device was already deployed in prisons; what was next, she and others asked — courthouses, schools, airports? “I am concerned … with expanding this type of product for the traveling public,” said another panelist, Stanley Savic, the vice president for safety at a large electronics company. “I think that would take this thing to an entirely different level of public health risk.”

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Research suggests that anywhere from six to 100 U.S. airline passengers each year could get cancer from the machines. Still, the TSA has repeatedly defined the scanners as “safe,” glossing over the accepted scientific view that even low doses of ionizing radiation — the kind beamed directly at the body by the X-ray scanners — increase the risk of cancer.

“Even though it’s a very small risk, when you expose that number of people, there’s a potential for some of them to get cancer,” said Kathleen Kaufman, the former radiation management director in Los Angeles County, who brought the prison X-rays to the FDA panel’s attention.

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As for the TSA, it skipped a public comment period required before deploying the scanners. Then, in defending them, it relied on a small body of unpublished research to insist the machines were safe, and ignored contrary opinions from U.S. and European authorities that recommended precautions, especially for pregnant women. Finally, the manufacturer, Rapiscan Systems, unleashed an intense and sophisticated lobbying campaign, ultimately winning large contracts.

(emphasis mine)

You have to love the Security Theater Industrial Complex.

This ain’t about keeping us safe, it’s about extracting money from the 99% for the benefit of the 1% by creating an atmosphere of unreasoning fear.