Sorry if I incorrectly paraphrased you on this, that was the point I was fumbling around trying to make. I don't know enough about MMW to make a case on the safety issue and many knowledgeable folks like you don't seem worried about the health implications. Conversely, there is a whole contingent of radiologists and scientists, including one from Johns Hopkins saying that the x-ray units pose some health risk. So, it is known that the underlying technology (x-ray) is potentially hazardous, it is simply a question of dosage. I think the MMW safety argument is probably the weakest of all of the points against TSA procedures, particularly while there are still x-ray scanners and strip searches going on. My point was that being too aggressive on this issue in the absence of evidence diverts attention away from the bigger problems and unfounded claims compromise credible arguments on those other issues. BTW, are the MMW electromagnetic or radio (sonic) waves? These articles usually say they use electromagnetic.