I'm not aware of RFID memory cards- for what?
What do you use them in?
Last month the phone company sent me a new card for my phone. I don't remember all the benefits they claimed but determining my location was one 'safety feature'. All I had to do was install the new card and the police would be able to locate me if I ever called 911 and asked for help.
I figure that since I don't drink enough to get drunk I alwasys know where I am. I'll keep the card in the drawer.