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Because so that they can keep track and they can't track you down.just look on the internet.It makes you wonder why everything has barcodes......

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Q: Why does everything need a bar code?
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What kind of code is your school ID? 1D or 2D? If you can see the data from the 2D bar code with your eye, there is no need for 2D bar code to exist any more.You can cnctaot me on Yahoo! message. Maybe I can help you if I know what code is it.