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There is this bright idea of placing RFID chips into banknotes. If it is implemented, microwaves become logical choice to store cash in because they're practic

• blixt 11y ago
  The only viable RFID would be a passive chip, which would require the scanner to be in close proximity to the notes anyway, so putting them in a mattress would be equally efficient. You could probably build a superpowered scanner that would detect the location of these notes, but I would suspect there would be so much noise in a home that it wouldn't be too easy. From a practical standpoint, should people start "hiding" their notes in their microwaves, that would be the first place to look if you're a bad guy.