Transcript for Credit Skimming: Stealing Your Credit
Just in time for the 4th of July weekend. Gas prices setting a high. For the year. Before you swipe that credit card, buyer beware. A growing scam that has consumers handing their personal information over to thieves. Here now is ABC's nick watt. Reporter: You are watching a brazen breed of credit card thieves caught on tape. Miss it? Watch it again. This McDonald's drive through attendant is swiping each card twice. One to charge for the food then again through something called a skimmer which steals the card's details. Crooks can use that to spend a fortune. Police say this bandit was stealing digits with up to 70 customers every single shift. They are so advanced they don't need a human to operate. They steal your credit card info if you pay at the pump. Steve and the United States secret service are now on the case. We're doing our best. We can use more help. Reporter: They're getting help from police departments and tip-offs from gas station owners and wait until you meet one of their former secret weapons. Somebody turned my parter in and he turned me in. Reporter: He is a reformed credit card hacker. He switched sides. Caught by the secret service and spent two years training agents in the dark art of skimming. So this is the reader that would be inside the gas pump. You would just sweep it through. And it would read it right here. Reporter: So what can you do to protect yourself? Check your account. Most credit card companies will suck up any loss if you report it within 60 days. Choose wisely. Choose a pump near the attendants. They prefer to target pumps in the shadows. And pay inside. Nick watt, ABC news. Some valuable information. Thanks to nick watt.
This transcript has been automatically generated and may not be 100% accurate.