Devices, systems and methods for detecting skimming devices are provided. The present disclosure provides for a card reader assembly including a face plate having a slot for receiving a card in a direction of entry into the slot; an array of infrared proximity detectors disposed on the face plate; and a controller configured to selectively activate the array of infrared proximity detectors to determine if an object, for example, a skimming device, is placed over the slot of the face plate.