From the Mercury News, San Jose police test head-mounted cameras for officers

San Jose police, under fire for interactions with the public that have turned violent, on Friday launched a pilot project equipping officers with head-mounted cameras to record contacts with civilians.
Officers will activate the cameras, about the size of a Bluetooth device and attached by a headband above the ear, every time they respond or make contact with a person. At the end of the officer’s shift, the recording will be downloaded to a central server.

And I wonder what else the government will use the recording devices for.