That's the idea behind PistolCam, a camera that can be mounted on any rail-equipped handgun.
PistolCam is the brainchild of Terry Gordon, a former corrections officer and avid hunter who invented SmartScope, a rifle scope that captures video of a hunt. At the urging of former New York City prosecutor Bill DeProspo, Gordon decided to repurpose SmartScope as a tool to capture video of officer-involved shootings.
PistolCam is a combination tactical illumination device (a 120-lumen LED with two hours of runtime), laser sight, and video system all in one. It weighs only 5.5 ounces.
Gordon says PistolCam can store up to one hour of near DVD-quality MPEG4 video and audio on permanently mounted flash memory. The video is encrypted, so the user cannot alter or erase the images and the evidence chain is preserved. However, the video can be downloaded by the officer so that it can be used to identify a suspect or shared with other officers who are searching for a suspect.
In addition to its one hour of video memory, the PistolCam can capture still images. After its video storage reaches 95-percent capacity, the camera goes into auto-stills mode, meaning that it will capture a still image when the weapon is discharged.