Credit Card security at gas pumps
For what it is worth. Apparently you cannot tell if devices like this are being used by the criminals. Bluetooth skimmer
Forum Discussion
These bluetooth skimmers have been a big problem in the tourist areas of Mexico. They get installed by ATM or fuel pump service people. One thing you can do is use your smart phone to look for a hot spot. If you get hot spots near the pump that don't make sense, pay inside.
