[Dan_Nguyen]

Adding onto this, a skin swab for a DNA sample is pretty useless. You have contamination from everything from skin flora to skin cells from other people you've had physical contact with. Given the very public nature of airports, contamination by others is not far fetched.

[jimrandomh]

To clarify, I didn't mean to imply that all those swabs get sequenced. That's too expensive to make sense. Rather, I'd expect them to be sequenced on demand if called for by a specific investigation.

[Dan_Nguyen]

Ah, gotcha. I misunderstood that one. My bad.

That said, I'm not too sure how that would work. They only check your boarding pass at the initial security check before the scanners, and the order at which people have their IDs checked is not preserved once you get to the scanners, so you can't track identification that way. On top of that, as someone who's been swabbed multiple times (I'm assuming something to do with my camera equipment), I've never been asked for identification when swabbed. So you might get some DNA to sequence, but you won't really know who it actually is.