I frequently have conversations with the TSA about their machines. They have been trained to discuss the differences between backscatter x-ray & MMW technology

I frequently have conversations with the TSA about their machines. They have been trained to discuss the differences between backscatter x-ray & MMW technology to allay concerns about the health risks associated with the former, especially in airports that only use the latter. They're typically very surprised to find that I'm very clear on the differences, and that my objection rides on the privacy implications rather than health concerns. Call me old fashioned, but we shouldn't let it become normal for the government to scan your body as a precondition to travel.