A system for detecting electronic article surveillance marker shielding includes an EAS subsystem a metal detector, a cart detection subsystem and a processor. The support unit has a plane portion, a support portion extending downwards from a front side of the plane portion, and an opening passing through the plane portion. A milling machine may then mill out the support tabs as designed without suffering the potentially undetectable defects in the milling process. The present invention comprises a safe, one time deployment of reusable barricades, thus eliminating the need to use conventional highway flares which burn hazardous materials.