Key concepts from the article:
Radio-frequency identification (RFID) tags are embedded in a growing number of personal items and identity documents. Because the tags were designed to be powerful tracking devices and they typically incorporate little security, people wearing or carrying them are vulnerable to surreptitious surveillance and profiling. Worldwide, legislators have done little to address those risks to citizens.
How RFID Tags Could Be Used to Track Unsuspecting People: Scientific American
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