[wpietri]

I don't think this is a very hard combinatorial problem. At least last time I flew, they scan my boarding pass when I'm pretty close to the scanners. They'd just have to pick me out of, say, 50-100 other scans. And once they establish decent time data on BP scan to body scan correlation, they'd be able to narrow the field further.

I agree with you, though, that your last point makes this moot. They're too bumbling for me to worry.