One concern that has been raised is that while the radiation is weak, it does not go through the body but is localized in the skin, and that the machines were n

One concern that has been raised is that while the radiation is weak, it does not go through the body but is localized in the skin, and that the machines were not properly certified as medical devices, so there was no way to know whether it leaked radiation, would malfunction in an unsafe manner. I think radiation concerns may be more relevant for people who have already had many X-rays due to disease, or workers who go through or have to be around these machines all day. My primary objection is that the cost of the machines isn't justified in the security improvement and potential privacy threats, and it's still easy to fool it as long as the X-ray isn't through-body. Getting through-body scanners certified and proved to be safe is going to be even more difficult, no matter how few minutes of flight you can compare it with.