• Fascinating topic. Thanks.

    It seems to me the ultimate biometric data would be some kind of very rapid DNA fingerprinting. But I agree that the copying issue is paramount. No matter how precisely one can identify a person, there is always a risk that someone else could copy that "fingerprint" and submit it to a sensor.

    Perhaps the weak point is in the submission of the "sample," whether it's a retina scan, thumbprint, etc. In the movies, it is already a cliche to see someone hold up a severed hand or (gross) eyeball to get past a biometric scanner. So unless someone can find a way to ensure that the item being submitted for scanning is in fact coming from the original, living person, then there is always a chance at a breach due to impersonation.

    - webrunner

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    A SQL query walks into a bar and sees two tables. He walks up to them and asks, "Can I join you?"
    Ref.: http://tkyte.blogspot.com/2009/02/sql-joke.html