I thought I read where the actual problem is not the video that there is no law on video, it's the sound. THe recording of the word that must be agreed upon by all parties being recorded.
I am going to try to find out more. Now filming the police themselves may be different, but I need to find out if photos are acceptable and if video without sound is recorded.
Also if I am recording you, standing in front of me, and I have your permission, then what happens if my recording picks up things behind you. At what point is it public access? I mean, I can't record my children at the park because I might accidently record other people?
Where is the cut off?
found this at first glance
http://photocinenews.com/2010/06/03/videotaping-law-enforcement-illegal-in-3-states/
In response to a flood of Facebook and YouTube videos that depict police abuse, a new trend in law enforcement is gaining popularity. In at least three states (Illinois, Massachusetts, and Maryland), it is now illegal to record an on-duty police officer even if the encounter involves you and may be necessary to your defense, and even if the recording is on a public street where no expectation of privacy exists.
The legal justification for arresting the shooter rests on existing wiretapping or eavesdropping laws, with statutes against obstructing law enforcement sometimes cited. Illinois, Massachusetts, and Maryland are among the 12 states in which all parties must consent for a recording to be legal unless, as with TV news crews, it is obvious to all that recording is underway. Since the police do not consent, the camera-wielder can be arrested. Most all-party-consent states also include an exception for recording in public places where no expectation of privacy exists (Illinois does not) but in practice this exception is not being recognized.