Patent ID: 8816854

Claim:
A system for detecting electronic article surveillance (“EAS”) marker shielding, the system comprising: an EAS subsystem configured to detect an EAS marker in an interrogation zone; a metal detector configured to detect a metal object in the interrogation zone; a cart detection subsystem including a sensor array configured to form a plurality of breakable beams, the cart detection subsystem configured to: detect a wheeled device passing through the interrogation zone by matching a pattern of broken beams to an expected pattern for a wheeled device; and detect a human passing through the integration zone by matching a pattern of broken beams to an expected pattern for a human walking; and a processor electrically coupled to the EAS subsystem, the metal detector and the cart detection system, the processor configured to: generate an alarm signal if the metal object and the human are detected, the alarm indicating a presence of EAS marker shielding.