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i agree that demanding perfect testing is ridiculous in most scenarios, especially when talking about human trials. however, that's not what i'm suggesting should happen. i also don't deny that the UCSF letter has a sensationalist or alarmist tone. i'm not touting their concerns, just suggesting it as a place that explains the difference between cosmic xrays and the xrays in these scanners. i guess my point is that it's very easy to mislead people that have no appreciation for these very real differences. glossing over details and nuance that have not yet been proven insignificant, and doing so with the goal of making concerned people stop asking questions about their own safety- that's not cool. when it's our own government it's even less cool.

there are so many issues swirling around this subject- privacy, security, safety, fear, "terror"... i guess i'm just wanting the science of the safety to be completely objective, open, reviewed, failsafes and failure modes known... all that jazz. as a member of the public it seems like these things were just thrown out there. the tsa is covering their butt by doing whatever is possible, a few scanner manufacturers are having a good year, and we're just supposed to leave it like that, keep calm, carry on... i can't say that makes me feel great.