U.S. Rep. Rush Holt, a scientist and the Chairman of the House Select Intelligence Oversight Panel, says the "TSA's current obsession with fielding body imaging technology is misguided, counterproductive, and potentially dangerous."

In March, the Congressional Biomedical Caucus (of which I am a co-chair) hosted a presentation on this technology by TSA, as well as a briefing by Dr. David Brenner of Columbia University on the potential health effects of "back scatter" x-ray devices. As Dr. Brenner noted in his presentation and in subsequent media interviews, the devices currently in use and proposed for wider deployment this year currently deliver to the scalp "20 times the average dose that is typically quoted by TSA and throughout the industry."

Dr. Brenner has pointed out that the majority of the radiation from X-ray backscatter machines strikes the top of the head, which is where 85 percent of the 800,000 cases of basal cell carcinoma diagnosed in the United States each year develop. According to Dr. Brenner, excessive x-ray exposure can act as a cancer rate multiplier, which is why our government should investigate thoroughly the potential health risks associated with this technology.