I guess they actually want to control movement of their ex-employees and prevent them from sneaking back in (i.e. using social engineering, insiders left behind etc.)... This method doesn't discriminate between person with implant and person with RFID concealed in a pocket, vallet, clothes or footwear. Since you cannot get rid of the tag (easily), it would be most appropriate for DENYING tagged persons access, not granting it (for latter, there are better ways).

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