A security system for detecting unauthorized NFC tags, comprising a NFC radio detection system having a NFC controller with scanning or interrogating abilities, a structure for housing the NFC radio detection system and at least one authorized NFC tag, a display provided on the housing and containing the at least one authorized NFC tag, at least one unauthorized NFC tag emitting a RF signal applied on or near the display or structure, the controller interrogating an area including the display and the structure to detect whether the at least one unauthorized NFC tag is present and an alarm to signal the presence of the at least one unauthorized tag based on results from interrogating the area.