As shown in a recent demonstration, fingerprint-based security can be easily fooled using Gummi Bears. Fake fingers created with gelatine, from sources such as Gummi Bears, are able to fool most commericial fingerprint scanners with an 80% success rate.

To prove how simple it would be to pretend to be someone else, the researcher took prints from a glass, enhanced them with super-glue, digitally photographed them, performed further enhancement and then printed them on a transparency. This transparency was used to etch a circuit board that was used to mould a gelatine finger. This also fooled commerical scanners 80% of the time.

This is the reason we don't want fingerprint-based security; even Gummi Bears know how to get through it.