Contra Costa CA Preschoolers Outfitted with Tracking Devices

http://articles.sfgate.com/2010-08-18/news/22225859_1_devices-students-tag
California students get tracking devices
August 18, 2010

California students get tracking devices
August 18, 2010

California officials are outfitting preschoolers in Contra Costa County with tracking devices they say will save staff time and money.

The system was introduced Tuesday. When at the school, students will wear a jersey that has a small radio frequency tag. The tag will send signals to sensors that help track children's whereabouts, attendance and even whether they've eaten or not.

School officials say it will free up teachers and administrators who previously had to note on paper files when a child was absent or had eaten.
Sung Kim of the county's employment and human services department said the system could save thousands of hours of staff time and pay for itself within a year.

It cost $50,000 and was paid by a federal grant.

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What happens if kids switch jerseys? I suppose the kids each hang them up at the end of the day and put them on at the beginning of the next day. How much time is spent doing this? Does an adult cross check and hand out jerseys to the corresponding child? Are their names on the jerseys or on tags on the jerseys? What about students that have same/common name? Or are these children given numbers and they become known by their number? Is there any other information included in the tracking devices? Just questions, since I don't have a lot of background info at this time.