An embodiment of the invention includes a device including at least one probe for delivering an electrical shock to a subject when the probe is in physical contact with the subject. A power source is connected to the probe for providing electrical power to the probe upon actuation of a trigger. The device further includes a medical device sensor for detecting signals emitted from a medical device present in the subject. In at least one embodiment, an alarm is connected to the medical device sensor, wherein the alarm provides an audio and/or a visual alert when the medical device sensor detects signals emitted from the medical device. In at least one embodiment, an override mechanism is connected to the medical device sensor, wherein the override mechanism prevents actuation of the trigger when the medical device sensor detects signals emitted from the medical device.