http://www.metacafe.com/watch/886450/fingerprint_system_nightmare/ is a bit annoying if you have the audio on but otherwise a very good example why finger print readers should not be used in my humble.
I have twice seen finger print scanners defeated in real life once using a very similar technique but a bit more CSI from the use of finger print powder and once by simply exploiting a known hardware flaw and shorting out the reader which caused it to replay the last scan unlocking the machine.
Time before last in the Microsoft staff shop in Redmond the there was a very nice sign on the Microsoft keyboard and finger print reader making it very clear that the finger print scanner was not allowed to be used on Microsoft machines.
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