pretty quick RFID will be in everything, i've personally dealt with the technology and the size of the IC is barely larger than a grain of sand, the antenna could easily be thread in a shirt etc.
it's more of a local-tracking thing, RFID is for identifying who and when and what is moving through doorways or along an assembly line etc. so it won't really have an effect once it's spent in circulation on the contractors originally planted.
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