A method according to one embodiment may include detecting an activated electronic article surveillance (EAS) tag in an interrogation zone, and reading at least one radio frequency identification (RFID) tag in response to the detecting of the activated EAS tag in the interrogation zone to investigate...http://www.google.fr/patents/US7304574?utm_source=gb-gplus-shareBrevet US7304574 - Alarm investigation using RFID
