Using the same technology that enables transportation managers to track the location of school buses, it's conceivable that educators some day might use special GPS-enabled bracelets to monitor the whereabouts of students, such as on a class field trip.

For now, the devices are too costly for most schools to consider. But given the recent spate of high-profile child abductions across the nation, cost isn't deterring some parents from purchasing the gadgets.

Eric Wasman, a mortgage broker from Redwood City, Calif., now double-bolts his front doors and shuts his windows


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