Honestly, my eyes glazed over a little bit reading (most) of this. But you should still read it. In much of the country, it's still kind of a legal gray area about whether or not you can record police.
I did an L.A. radio show a while back and a cop called in with a very insightful comment: older cops are still bothered by people filming them or taking their picture. Younger cops think it's pretty normal for people to be holding up their phone when something interesting in happening.
Regardless, the advice I would give to police officers is that it will undoubtedly be legal and protected in the future. So stop fighting it and get used to it.