Techniques are disclosed for detecting shoplifting or theft, particularly in a retail environment, using radio-frequency identification (“RFID”). Preferred embodiments leverage RFID tags on merchandise and RFID data that is written at the point of sale on the merchandise-borne RFID tags themselves,...http://www.google.co.uk/patents/US7012528?utm_source=gb-gplus-sharePatent US7012528 - Using radio frequency identification with transaction-specific correlator values written on transaction receipts to detect and/or prevent theft and shoplifting
