A system for detecting electronic article surveillance ("EAS") marker shielding includes an EAS subsystem, a metal detector, a people counting system, and a processor. The EAS subsystem operates to detect an EAS marker in an interrogation zone. The metal detector operates to detect a metal object in the interrogation zone. The people counting system operates to detect one or more people in the interrogation zone. The processor is electrically coupled to the EAS subsystem, the metal detector and the people counting system. The processor is programmed to receive information outputted from the people counting system and information outputted from the metal detector to determine whether to generate an alarm signal based on the presence of EAS marker shielding.