Abstract: A threat detection and warning system for a law enforcement officer includes a recording/sensing device, computing device, and device for providing feedback to the officer. The recording device is controlled manually by the user or can be automatically triggered by either an external or internally derived signal. An external signal can be from another similar device already recording, a signal from a vehicle-based device that has been triggered or any other device within range. An internal trigger can be derived by analyzing locally collected data by the computing device. The computing device can analyze data from the recording device looking for threats or situations of interest or persons of interest to the officer. These threats can include weapons or simply an individual acting in a threatening manner. Fast feedback to the officer can be provided by an augmented reality user interface, which can include a display visor, glasses, contact lenses, wrist-worn devices, cell phones, etc.