How to Keep Your Credit Card Safe from 'Skimming'

This high-tech pickpocketing technique accounts for the majority of ATM fraud each year.
3:05 | 09/18/14

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Transcript for How to Keep Your Credit Card Safe from 'Skimming'
Now to "Gma" investigators. High-tech pickpocketing. Credit card/debit card scam called skimming. Accounts for 80% of the estimated $1 billion loss in ahf fraud. Mara schiavocampo is here and has the story. Reporter: Good morning. It's happening all over the country at pretty much any place where people use credit or debit cards. Thanks to virtually undetectable devices, thieves steal all the information in one single swipe. It's the latest in high-tech pickpocketing. Happening right under your nose. Thieves stealing your credit or debit card information when you swipe. On barely detectable devices, some tiny enough to fit right in the palm of your hand. Called skimming, "Gma" investigators learning it's more common than ever. It used to be the skimming device was large. Now it fits in your pocket. Could be on your belt. Could be alongside of the cash register. Reporter: Richard Norris says his stop for fast food led to a quick theft. I would have never pointed my finger at a drive through. You're sitting there, watching them use your card. Reporter: Take a look here, we can see the mcthief swiping a customer's credit card twice. Once for an actual food order, and then again on a skimmer, copying the info. They were able to catch the individual sliding the card and grabbing the receipt and hand it to me all in one nice movement. You'd never know he was doing anything wrong. It's not just restaurants. Surveillance photos at a new Jersey bank caught this man setting up a skimmer on one of their atms. And when authorities in Arizona found a skimmer in a Phoenix gas station pump -- We were checking for skimming devices. Reporter: They decided to set up a sting. Removing the skimmer and replacing it with a hidden camera, to catch the crooks frantically searching for the device. So it's almost like a husband and wife team arguing about wherever their skimmer is, because somebody got it. That was us. We got it. Reporter: What should you do to cope your information safe? Officials say choose a pump near the attendant or pay inside. Look closely when swiping your card for anything unusual, and check your account frequently. Take a few minutes to ensure what you believe is in front of you is an atm. Look for things out of the norm. Reporter: Mara schiavocampo, ABC news, New York. Now officials say they've made more than 5,000 skimming arrests since 2011. A as law enforcement gets better, they get more sophisticated. So little you can do. Hard to protect yourself.

This transcript has been automatically generated and may not be 100% accurate.

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