disputed situations. james forward from wpix reports. >> this is the demonstration of police body cameras that the nypd set up on wednesday. compare that with this the real thing today. do you see the camera on that officer? you have to look closely. it's meant to be unobtrusive. >> this is how the device is worn and this is how it works. right now, it is not in operation. now it is. >> it takes about four seconds for the camera to start recording and is intended to increase information available about police interactions with civilians. but not every civilian is sold on it. >> i don't think it makes a difference. >> even if stuff get recorded, the cops are still going to win because they're going to say that the person that they or doing whatever to was in the wrong. >> it's been widely noted eric can garner's take-down and subsequent death in police custody was recorded on plubl cameras bibi standers but there