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Last week however the Mirror grasped (albeit somewhat shakily) the import of this and deduced that "spy chips" in ID cards "carry radio transmitters" and will mean "law abiding citizens" will be tagged like criminals on parole." In its defence, the Mirror has managed to get to pretty much the right answer via a slightly esoteric route, and it does seem to have seen a letter from Burnham where he concedes that radio is somehow involved : "a travel document such as an identity will need to incorporate a 'contactless' or 'proximity' chip. This will require the card to use radio frequencies to allow the card to be read at a very short distance." (The Register)