This is interesting and, well, pretty obvious. Cops are on their best behavior when they know they’re being recorded. You know who else is? Everyone around them. And the carryover effect is that cops are on their best behavior even when they’re not being recorded, once they’ve worn a body camera for a while. As a libertarian (I know, 2nd time in one week) I hate the idea of cameras everywhere, but that ship has sailed. With that in mind, I’d love to hear a cogent argument against hanging a body cam on every cop on the street, because it looks like the results speak for themselves.