If not, why not?
No. Electronic article surveillance (EAS) tags typically have a one-bit chip that is either on if the item hasn't been purchased or off if it has. If the gate reader detects the tag, then an alarm sounds. Typically, the system is used as a deterrent to theft—and it's a fairly effective one, at that. One advantage of RFID systems is that they tell you exactly which items have been stolen, so that they can be replenished.
—Mark Roberti, Founder and Editor, RFID Journal