I have no doubt that they do.
With a camera in your own car you have both a video and audio recording of the incident that is your property.
Call it an extra layer of protection and certainty.
I have no faith that the officer's camera will be on or even functioning (not implying that this is on purpose because sometimes equipment malfunctions or fails outright.)
Before this starts arguments, I believe that most police are on my side and are good people.
Being in the firearm hobby I have many officers I call friends, they're great people who do a tremendous job.
However, like anything else, there are also not so good ones.
For me, the camera is there mainly to document encounters with other drivers.
There's not always others around when things happen and a camera is an excellent witness should things go south.
With that being said, does anyone have any recommendation on a good camera? Any that record speeds with GPS? I know my radar detector has a GPS built into it and constantly shows my speed, but it'd be hard to get that on camera.