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The ability to recognize people automatically by analyzing bodily characteristics such as fingerprints, faces and eyeballs, collectively known as biometrics, has long been a goal of technologists and governments alike. Plans for large-scale projects to incorporate biometric scans into passports, identity cards and visas are now under way in several countries. Since January 5th the US has been scanning foreigners from particular countries as they arrive at its airports. Both the US and Europe plan to start issuing biometric passports as soon as next year. Biometric identity cards are being adopted in Hong Kong and Oman, and Britain plans to follow suit. Biometric technology has been around for quite a while, but has not been widely adopted, for good reason: while it can improve security in some situations, its costs more frequently far outweigh its benefits. Even the most advanced systems falsely reject a small proportion of legitimate users, and falsely accept illegitimate ones. At best, the introduction of biometric identity documents will produce a marginal increase in security, at enormous cost. But at worst, biometrics could, in fact, reduce security in several ways.

1. According to the passage, the use of biometric technology ----. Submit

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