Patients are increasingly reliant on implantable medical device systems today. For patients with diabetes, an implantable insulin pump system can greatly improve their quality of life. As with any device, these devices can and do suffer from software and hardware issues, often reported as a safety event. For a forensic investigator, a safety event is indistinguishable from a potential security event. In this paper, we propose a new sensor system that can be transparently integrated into existing and future electronic diabetes therapy systems while providing additional forensic data to help distinguish between safety and security events.