They have Zombie
RFTD tags Security, privacy and ethics problems with RFID
The following problems with RFID tags and readers have been reported.
The contents of an RFID tag can be read after the item leaves the supply chain
An RFID tag cannot tell the difference between one reader and another. RFID scanners are very portable; RFID tags can be read from a distance, from a few inches to a few yards. This allows anyone to see the contents of your purse or pocket as you walk down the street. Some tags can be turned off when the item has left the supply chain; see zombie RFID tags.
What Are Zombie RFID Tags?
One of the main concerns with RFID tags is that their contents can be read by anyone with an appropriately equipped scanner - even after you take it out of the store.
One technology that has been suggested is a zombie RFID tag, a tag that can be temporarily deactivated when it leaves the store. The process would work like this: you bring your purchase up to the register, the RFID scanner reads the item, you pay for it and as you leave the store, you pass a special device that sends a signal to the RFID tag to "die." That is, it is no longer readable.
The "zombie" element comes in when you bring an item back to the store. A special device especially made for that kind of tag "re-animates" the RFID tag, allowing the item to reenter the supply chain.
RFID tags are difficult to remove
RFID tags are difficult to for consumers to remove; some are very small (less than a half-millimeter square, and as thin as a sheet of paper) - others may be hidden or embedded inside a product where consumers cannot see them. New technologies allow RFID tags to be "printed" right on a product and may not be removable at all (see Printing RFID Tags With Magic Ink).
RFID tags can be read without your knowledge
Since the tags can be read without being swiped or obviously scanned (as is the case with magnetic strips or barcodes), anyone with an RFID tag reader can read the tags embedded in your clothes and other consumer products without your knowledge. For example, you could be scanned before you enter the store, just to see what you are carrying. You might then be approached by a clerk who knows what you have in your backpack or purse, and can suggest accessories or other items.
RFID tags can be read a greater distances with a high-gain antenna
For various reasons, RFID reader/tag systems are designed so that distance between the tag and the reader is kept to a minimum (see the material on tag collision above). However, a high-gain antenna can be used to read the tags from much further away, leading to privacy problems.
RFID tags with unique serial numbers could be linked to an individual credit card number
At present, the Universal Product Code (UPC) implemented with barcodes allows each product sold in a store to have a unique number that identifies that product. Work is proceeding on a global system of product identification that would allow each individual item to have its own number. When the item is scanned for purchase and is paid for, the RFID tag number for a particular item can be associated with a credit card number.