My wife can't go through these scanners, as she has a medical device that the device manufacturer has warned have not been certified to go through them, and will not be liable if the device stops working (which in this case would mean she dies.)

At the airport, she always has to opt-out and get a pat-down (or did, until she broke down and paid the brib...err, "fee" for pre-check.)

Will she be safe walking around areas that use these scanners? Will the users of the scanners be required to announce that they are in use? Will there be an opt-out process? How would that even work in a public space? If she opts-out, is she going to end up getting felt-up by some untrained minimum wage pervert with a power complex? Who is liable (legally and financially) if her device stops working because someone made her go through a scanner without her knowledge or consent?

This is bullshit for so many more reasons that surveillance (though that is also important.) This is literally a life or death concern for us.