Using biometrics seems like a good idea at first. Unique physical characteristics that only one person can ever have.
Its flawless in theory. But in practice, biometrics are a long way off perfect.
Using biometrics, such as fingerprint technology (currently the most common kind), is kind of like saying, "I'm not going to tell you my password, but if you look carefully at every item i've touched in this room you'll notice that i've actually written it everywhere."
It just doesn't work yet.
For some further (relevant) reading on the matter:
http://www.bromba.com/faq/fpfaqe.htm
http://www.blackhat.com/presentations/bh-europe-06/bh-eu-06-Kiviharju/bh-eu-06-kiviarju.pdf
http://www.instructables.com/id/How-To-Fool-a-Fingerprint-Security-System-As-Easy-/
http://www.youtube.com/watch?v=mYAs1R9yfFE
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