If you've been following the story, you'll know that Johns Hopkins played a role in evaluating these scanners, but the institution has been vociferous in its insistence that the study did not evaluate the safety of the scanners. Not to be dissuaded, HHS has continued to imply that the Johns Hopkins analysis supports their claim that scanners are safe to use on all people as primary screening at airports. Sedat starts by saying:
There is Still No Rigorous Hard Data For The Safety of X-Ray Airport Passenger Scanners.
...The [Johns Hopkins] document is heavily redacted ... In every case the electric current used which correlates one to one with X-ray dose has been specifically redacted. Thus there is no way to repeat any of these measurements. While the report purports to present the results of objective testing, in fact the JHU APL personnel, who are unnamed anywhere in the document either as experimenters or as authors, were not provided with a machine by Rapiscan. ... There are also [technical] issues ... The data given in the Johns Hopkins report indicate that there must be something wrong.I've deleted much of the technical points (which are important for context) to make one of Sedat's points clear: This does not in any way, shape, or form follow acceptable standards for scientific research. If the TSA just wanted to bake a birthday cake, it wouldn't be such a big deal. But they are currently shooting ionizing radiation at the general population in airports across the nation without so much as a single peer-reviewed study on the safety of the machines being published. The letter continues: