A couple years ago, my co-worker was surprised with a $20,000 bill on one of her credit card. Since the charge was too large, the credit card company did an investigation. The card registered that it was used at a high-end clothing store, so they went to the store to check the surveilance camera. Sure enough they found the person, who turned out to be the temporary employee at my company who was hired to help out my co-worker!!!
Of course, she was fired immediately. My co-worker & the credit card company brought her to court. With undeniable evidences, she had to pay back every pennies to the credit card company, plus the court fee to my co-worker, and serve her sentence.
Justice had won out for my co-worker, but I think for the small charges, the credit card company normally just lets it go, which makes it too easy for someone to steal. I think they should do an investigation every time, and bring the offendant to justice.