In Butler County, Kan., deputies are going to start wearing cameras while they're on the job, the AP reports. It sounds like a test case at this point, though the sheriff's office does have 50 of the devices. They're voice-activated, and after a shift is over, the video is downloaded for storage. The police department in Columbia, Mo., has started using these kinds of cameras, too, though I'm not sure how widely.
Seattle has been talking about having its police wear cameras, though there are still issues to be ironed out -- including whether their officers will willingly go along with it.