Can tags be reactivated?

EPCglobal, the nonprofit organization that is developing standards for the use of EPC technology, has stipulated that all EPC tags should have a feature that enables them to be rendered permanently inoperably by the kill command. This is to prevent anyone from reactivating a tag and using it to track a person without their knowledge. It's always possible that a design flaw is discovered which enables someone to reactivate a tag. No such flaw is known to exist at this time.

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