Re: Slightly icky new biometric

[Valdis.Kletnieks () vt edu]

On Thu, 18 Mar 2010 10:59:10 -0000, Jim Murray said:

> Seems a somewhat dubious biometric to me. Wouldn't simply putting your
> hands in bleach (or similarly strong bug-killing solution) be enough to
> significantly change the makeup of bacteria there?

The problem is that bleach will kill all the little bugs fairly evenly,
so 99% of *everything* dies off.  There's still plenty of those oddball
genome bugs left over for identification purposes.  If your bacteria mix
was 42% A, 17% B, and small amounts of of statistically rare C, E, and J,
then after the bleach you'll still have roughly that same mix.  And if after
bleach they find a keyboard that's got lots of A, a bit of B, and traces of
C, E, and J, that may not be enough to convict you, but it's probably good
enough to hang a search warrant on.

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