1. A method of detecting a fraudulent transaction of an item having an item-identifying indicium, wherein the item-identifying indicium includes at least one of a bar code, an RFID tag, a magnetic stripe, a pattern code, a two-dimensional bar code and a non-visible identification sign, the method comprising: processing the indicium to obtain item-identifying information; capturing a digital image of a predetermined surface area of the item; using the item-identifying information to retrieve a stored digital image of the predetermined surface area of the item; and comparing the captured digital image with the stored digital image to determine if the captured digital image corresponds to the stored digital image.