Card Skimmers can be anywhere you swipe your credit or debit cards; ATM's, gas stations or even your local post office. It is important to be observant before you swipe, but unfortunately many of these can be very difficult to detect. Thieves are now trying a new type of wiretapping device that can steal your account numbers without needing access to your card’s magnetic stripe.
Fox Van Allen of Techlicious explains in his article Beware New 'Wiretap' ATM Skimmers, one way that they do this:
Criminals drill a small hole into the front of an ATM machine where the “insert card” decal is located. They then feed a wire into the machine using a metal rod to tap the ATM’s existing card reader. A new decal is then pasted over the hole, making the crime incredibly difficult to detect.
Van Allen also describes another device being used called an “insert transmit skimmer.” Please read his entire article to learn about this threat here.
Both of these new devices require a hidden camera for thieves to steal your PIN, so always cover your hand when entering your pin.