Security researcher Chris Paget thinks it might be happening after he fell victim during a recent Vegas visit for DefCon. The FBI is investigating this after multiple claims that cards are being debited but cash is not being delivered. The concern -- according to the PC World article we linked to -- is that the cash may be going to someone who shouldn't be receiving it (you know...a criminal!).
Does Paget's name sound familiar? It just might. He's the guy who is known for demonstrating the weakness of RFID technology in the U.S. passport cards (see YouTube video about his ability to surreptitiously read the passport cards).