New technology can identify you by unique traits in your eyes, your voice, and your gait. Is there cause for alarm?
What is biometrics?
It is the science of identifying individuals by their unique biological characteristics. The best known and earliest example is fingerprints, used by ancient Babylonians as a signature and by police since the turn of the 20th century to identify criminals. But in the last decade there has been a boom in more advanced biometric technology, allowing people to be identified, and sometimes remotely tracked, by their voices, the irises of their eyes, the geometry of their faces, and the way they walk. The FBI is currently consolidating existing fingerprint records, mug shots, and other biometric data on more than 100 million Americans into a single $1.2 billion database. When it is completed, in 2014, police across the country will theoretically be able to instantly check a suspect against that vast and growing array of data. Law-enforcement officials are enthusiastic about this growing power, while civil libertarians are aghast. "A society in which everyone's actions are tracked is not, in principle, free," said William Abernathy and Lee Tien of the Electronic Frontier Foundation. "It may be a livable society, but would not be our society."