. . . is not in doubt. But as technology advances, it will not be as strong an identifier as it has been up to now. Scientists have demonstrated that they can fabricate it.
I wrote about the qualities of identifiers – fixity, distinctiveness, and permanence – in my book Identity Crisis. The ability to fabricate DNA renders it slightly less distinctive.
The Technology Liberation Front is the tech policy blog dedicated to keeping politicians' hands off the 'net and everything else related to technology.