kind of like throwing tuna to the sharks. and we ll see what happens. all right. let s do it. reporter: we test the waters as clements, pretending to be a thief, offers to sell some of our bait cards. i m going to hit the stopwatch, and we re going to see how long it takes before somebody hits on it. reporter: the response is almost instantaneous. somebody saying, hey, bro. 12 seconds. reporter: at first the thieves appear to be feeling us out to see if we re for real. we have another one. nitro 81 just said howdy. 26 seconds. reporter: but it doesn t take long for the thieves to take the bait and start making purchases with our cards. they re hitting it. reporter: at the credit card monitoring center, the fraudulent charges are beginning to roll in. at first, they re small charges to make sure the card works. they checked it for a dollar. reporter: for a dollar? they re just probing to see if it will work? right. reporter: they even make a small d