Right here. Apparently, a TSA agent told an angry mother--whose child was about to be groped by TSA agents--that the Rapiscan (yes that is its real name) used for screening used the same technology as a sonogram.
For reference, the Rapiscan uses microwave energy, while a sonogram (ultrasound) uses sound energy at a much lower frequency. Moreover, given that the frequency used for a Rapiscan is far different from a cell phone, it's really hard to tell which is safer, especially given that most clinical tests of the effects of microwave and RF radiation are inconclusive.
Now I don't expect TSA agents to be experienced in clinical trials, but I do expect them to know that their tool works with microwave radiation, not sound.
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