[porkbeer]

Like the security conscious type that would attend defcon? Bringing a burner phone is the norm.

[Ekaros]

And if you are going to DEFCON you are likely to be tagged in a few databases anyway. At least if they can identify your attendance.

If I was running CIA, NSA and not named ones. I certainly would collect that information.

[antupis]

yup and mainly for recruitment purposes.

[dumpsterdiver]

Yeah, it kind of just shows good judgement in that particular scenario. Flag away.