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LONDON - OCTOBER 14: A fingerprint scanner is demonstrated during the Biometrics 2004 exhibition and conference October 14, 2004 in London. The conference will examine the role of new technology such as facial recognition and retinal scans to determine identity to improve security. (Photo by Ian Waldie/Getty Images) *** Local Caption ***

LONDON - OCTOBER 14:  A fingerprint scanner is demonstrated during the Biometrics 2004 exhibition and conference October 14, 2004 in London. The conference will examine the role of new technology such as facial recognition and retinal scans to determine identity to improve security.  (Photo by Ian Waldie/Getty Images)   *** Local Caption ***