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The rapid embrace of biometrics for determining identity after the events of 9/11 has ushered in a revolution in the world of law enforcement and security. Biometrics is not new to law enforcement; an Argentinian criminologist took the first fingerprint 125 years ago. Fingerprints are the most common, followed by iris and facial recognition, with gait and voice recognition becoming more popular. Unlike passwords, badges, or records, biometric data cannot be forgotten, exchanged, stolen, or forged.