I will bet my left nut that if such a technology exists TSA may use it based on their discretion on any person entering the US including citizens and most citiz

I will bet my left nut that if such a technology exists TSA may use it based on their discretion on any person entering the US including citizens and most citizens will be okay with it and the Supreme Court will hem and haw about it for years before giving some weak half ass decision against it that won't be enforced at all.