Towel Thieves Beware

In another display of how technology is changing our lives, hotels are now experimenting with washable RFID scanners in linens and robes.  Customers who pay by credit card and walk out with the stolen merchandise can be billed for it.  Eventually, this is going to be how all shopping will take place.  No more lines at Wal-Mart, no more old-fashioned cash transactions.  What I'd like to know is how they are going to protect the public from hackers and thieves (not the robe-stealing kind).  Also, what will be done for mistakes, for they are sure to happen.