Following allegations police had stolen a laptop and a digital camera from a suspect's house, San Francisco PD is considering equipping officers with a head-mounted video camera to document searches and arrests and make sure they're being conducted appropriately. Is this a good idea?...
One of the interesting things is that the cameras, which capture video directly from the officer's perspective, have been used several times to exonerate officers.
http://consumerist.com/2011/05/should-we-put-cameras-on-cops-to-keep-them-honest.html
Additional:
San Francisco police to carry video cameras during arrests [SF Examiner]
Keeping Cops Honest with Body-Mounted Cameras [GOOD]
San Jose police get ear-mounted video cameras in battle for image [Christian Science Monitor]
Police Head Cameras Capture Action, Evidence [CBS]
Seattle Mulls Over Police Body Camera Option [KUOW]