When LE body cams was brought up in the past, Mayor R-B expressed concern for residents’ privacy. She said at the time that officers would have to inform residents they were speaking with that the camera was “on” and turn it off if asked.
Mayor R-B on body cams back in February:
http://www.baltimoresun.com/news/maryland/bs-md-body-camera-report-20150218-story.html