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What do you all think of RFID (radio frequency id)?

What if the chip is both read and write mode (the ones I know of are read only, but if it can be written over, could be an "issue" as far as hiding or encrypting the id numbers)...

It should be fairly easy to create a device that only emits.

Originally posted by Symmetric Chaos
It should be fairly easy to create a device that only emits.

yeah, of course.