I guess looking into this a bit further is in order, but it does not effect me as a Wal-Mart customer one bit, but it's something to think about when ever we use credit and debit cards no matter where we shop. I always look at my receipt when I get to my car out of habit, and it's not because of a cash back issue, but to glance at the list for other reasons, such as pricing errors which do occur by any merchant on rare occasion.

I also don't see how a cashier at any store could pull this off very long, because people check their statements online, and if nothing else, once a month when the statement comes in the mail. I NEVER get cash back on a credit card, nor do I even use a debit card for any purchase, so I'd catch this real quick and report it as fraud in a heart beat.

If nothing else, awareness is a good thing.