Since the terrorist attacks of Sept. 11, Littleton, Mass.-based Viisage and rivals have stepped into the spotlight as national security becomes a top priority for lawmakers and airports. Viisage's technology uses biometrics, or the digital analysis of characteristics such as facial structure, fingerprints and iris patterns taken through cameras or scanners. The data is matched, for example, to profiles in databases of suspected terrorists. Although the technology has been heralded for its importance in capturing alleged terrorists, it has also been criticized for its potential inaccuracy.
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