Have them pull there Time cards.
They have to Clock in and out for lunch, but not for breaks. I bet Walmart is not getting the money back for the extra long breaks these people took?
I work at Wal-Mart and recently they fired a guy at my store that would clock back in from lunch then would spend an additional 2 hours or so in the break room not working. He got away with this for a short time but was caught.
We have to take a mandatory lunch break according to the 6 hour rule mentioned in the story. I really don;t know where this stuff comes from.