mingwan, Damn, that's embarassing.
You know, as I wrote it I did a mental 'take' thinking I don't want to screw this up again, and then I did it anyway.
Rest assured that homeland security knows.
I'm not sure what you mean by this,
"Perhaps there are potential applications related to e.g. cross-checking ancestry against self-reported geographical origin for visa applicants?"
Are you suggesting that visa applicants will need to send a dna sample with their visa application?
I doubt that is feasible. It would seem likely that someone willing to lie about his GEOGRAPHICAL origins would be capable of providing an equally false but congruent sample.
regards,
frog