Reason 1. - iPhone's fingerprint biometrics defeated, hackers claim.
Just one day after the new fingerprint-scanning Apple iPhone-5s was released to the public, hackers claimed to have defeated the new security mechanism. After their announcement on Saturday night, the Chaos Computer Club posted a video on YouTube which appears to show a user defeating Apple’s new TouchID security by using a replicated fingerprint. Apple has not yet commented on this matter, and, as far as I can tell, no third-party agency has publicly validated the video or the hacker group’s claim. In theory, the techniques used should not have defeated the sub-dermal analysis (analyzing three dimensional unique aspects of fingerprints rather than just two-dimensional surface images) that Apple was supposed to have used in its fingerprint scanner. (more)
Reason 2. - Mythbusters.
Reason 3. - When You're Busted.
Police can't compel you to spill your password, but they can compel you to give up your fingerprint.
"Take this hypothetical example
coined by the Supreme Court: If the police demand that you give them
the key to a lockbox that happens to contain incriminating evidence,
turning over the key wouldn’t be testimonial if it’s just a physical act
that doesn’t reveal anything you know.
However, if the police try to force you to divulge the combination to
a wall safe, your response would reveal the contents of your mind — and
so would implicate the Fifth Amendment. (If you’ve written down the
combination on a piece of paper and the police demand that you give it
to them, that may be a different story.)" (more)
