[Hnrobert42]

I fly a lot. I always opt out, usually in Atlanta but I think in other airports. There are signs up they say you can opt out.

This is both in the precheck security line and when boarding international flights.

It was an issue once with a Delta employee who didn’t know I could opt out. And once with border control in Ireland (where ICE has a presence). There, the ICE employee manually verified me but still insisted I get a photo taken.

Otherwise, it’s not been an issue to opt out so far. The staff might be a little annoyed, but it goes just as fast.