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Biometrics--automated identification gadgetry--was once the stuff of sci-fi movies. A hand placed on a pad would magically open a door on the planet Galaxos; or a scan of a face would trigger an alarm in the workshop of Despota, Duchess of Doom.
Now, however, such technologies are gradually becoming part of daily life. Children in more than a dozen school districts in Pennsylvania pay for lunch by placing a finger on a scanning pad. A computer recognizes each child and bills the appropriate account for the meal. Members of the San Antonio City Employees Federal Credit Union, in Texas, access safe-deposit boxes via hand scans. Casinos use face-recognition software ...