In reply to Anon Techie.

Your scenario is also possible, but mine is even simpler...
You write some software that injects itself between the matching algorithm and the reader... then you feed someone else's binary print data (fraudulently obtained somehow) when challenged. Obviously some collusion is needed, but people will do everything for a coupe of bucks. Needless to say this is all hypothetical...
The underlying concern here is:
If there are systems that use biometrics for identification, losing your digital biometric condemns you forever. I don't know of any successful fingerprint alteration surgery.
Biometrics are for authentication not identification.