Systems and methods for detecting fraud. One method includes providing an input device, the input device having processing circuitry, a memory, and at least one information receiving module for receiving information associated with a user of the input device. The method also includes providing a sensor in electronic communication with the processing circuitry. The sensor has a sensor coil, and the sensor coil is disposed proximate the at least one information receiving module. Further, the method includes flowing alternating electrical current through the sensor coil to generate a magnetic field, measuring at least one electrical characteristic of the sensor, and providing first information representative of the at least one electrical characteristic to the processing circuitry. Finally, the method includes storing in the memory second information representative of at least one predetermined value of the at least one electrical characteristic and comparing the first information with the second information.