Jan. 26, 2012 - Sen. Susan Collins, the top Republican on the homeland security committee, plans to introduce a bill in the coming days that would require a new health study of the X-ray body scanners used to screen airline passengers nationwide.
The Transportation Security Administration began using the machines for routine screening in 2009 and sped up deployment after the so-called underwear bomber tried to blow up a plane on Christmas Day of that year.
But the X-ray scanners have caused concerns because they emit low levels of ionizing radiation, a form of energy that has been shown to damage DNA and mutate genes, potentially leading to cancer. ProPublica and PBS NewsHour reported in November that the TSA had glossed over cancer concerns [1]. Studies suggested that six or 100 airline passengers each year could develop cancer from the machines.
Shortly after our report, the European Union separately announced that it would prohibit X-ray body scanners [2] at its airports for the time being "in order not to risk jeopardizing citizens' health and safety."
The new bill drafted by Collins would require the TSA to choose an independent laboratory to measure the radiation emitted by a scanner currently in use at an airport checkpoint. The peer-reviewed study, to be submitted to Congress, would also evaluate the safety mechanisms on the machine and determine whether there are any biological signs of cellular damage caused by the scans.
In addition, the bill would require the TSA to place prominent signs at the start of checkpoint lines informing travelers that they can request a physical pat-down instead of going through the scanner. Right now, the TSA has signs in front of the machines noting that passengers can opt out. But the signs mostly highlight the images created rather than possible health risks.
The bill is the latest volley in a back-and-forth between Collins and the TSA. At a hearing in November, TSA administrator John Pistole agreed [3] to a request from Sen. Collins to conduct a new independent health study.
But a week later at another hearing, Pistole backed off [4] the commitment citing a yet-to-be-released report on the machines by the Department of Homeland Security's inspector general.
"I have urged TSA to move toward only radiation-free screening technology," Collins said in a statement to ProPublica. "In the meantime, an independent study is needed to protect the public and to determine what technology is worthy of taxpayer dollars."
The TSA uses two types of body scanners [5] to screen passengers for explosives. The X-ray machines, known as backscatters, look like two refrigerator-size blue boxes and are used at Los Angeles, Chicago O'Hare, New York's John F. Kennedy, and elsewhere. The other machine, which looks like a round glass booth, uses electromagnetic waves that have not been linked to any adverse health effects. Those machines are used at airports in Dallas and Atlanta, among others.
"All the previous independent testing showed that the machines are well below the national standard," TSA spokesman Greg Soule said.
A group of vocal critics, primarily based at the University of California, San Francisco, has cast doubt [9] on those tests, suggesting that the device used to measure the radiation isn't equipped to provide accurate measurements on body scanners, among other flaws.
While not commenting specifically on the drafted legislation, Soule said, "the TSA is committed to working with Congress to explore options for an additional study to further prove these machines are safe for all passengers."
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