I think it's quite common to say that the probability (of someone else having the same DNA) is 1 in a billion.
Maybe for this one bloke, if we can be hundred percent sure he’s got no separated-at-birth twin. Otherwise, for any
random person, it’s should be much, much higher. At least for practical purposes.
Just ask identical (monozygotic) twins Hassan and Abbas O. from Germany, neither of whom could be jailed for their alleged participation in a 6 million dollar heist. Authorities in their investigation were able to turn up good DNA evidence - which in their databases conclusively pointed to ...well,
both subjects, as they their respective DNA was indistinguishable:
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