I know my response may be a bit lengthy, however, Rights of a Photographer is a complex topic.
The problems with the rights of a photographer, versus the directives by law enforcement agencies issued to their officers, appear to be growing in complexity.
Private and Public Rights as well as National Security statutes appear to be migrating into each others boundaries as such confusion grows, and conflict arises. Federal, State, County, and City laws / statutes, and the subsequent directives handed out to the field may be misinterpreted. Some law enforcement agencies tend to error on the side of Protecting the rights of the injured, while stepping on third party (photographer) rights in the process.
The following link is IMO well written, well researched, and informative.
http://www.bobatkins.com/photography/tutorials/photography_law_rights.htmlThis article also cites laws by state for certain issues. Good to know.
The one observation that stands out among all the issues mentioned above is the effects on your life, if you come into conflict with a policeman and you are arrested, your photography equipment seized, perhaps handled inappropriately, and then stored in an evidence locker. I have heard the if you break my stuff, you will pay statement; please tell me if anyone reading this has ever collected money from a police agency for damage to seized property? You may have from your own insurance company, but from the police?
Being fingerprinted, photographed, and having a record created about your arrest is not a good thing. Subsequent to your arrest, contacting an attorney, filing requests for records, depositions, law suits, and court hearings, are all expensive, time consuming and stressful.
Unless you enjoy such events, perhaps contacting the respective States Attorney Generals office and obtaining a copy of the law(s) addressing such issues, then contacting the law enforcement agency with jurisdiction over the territory you anticipated visiting, and getting their read on what you intend to photograph, would better serve you. Always get names, rank, and dates when speaking to any person of authority, and keep it in your immediate possession.
In summary, two points to consider; (1) if you come into contact with a police officer, and he issues you an order, I suggest you obey the order, and then file a complaint with the respective agency if you feel the order inappropriate, but do so after the fact and avoid confronting the officer. It matters not whether he is badge happy, or a good cop following orders as he was instructed.
(2) Know the law / statute in your state, and be prepared to bring it to the supervisors attention. Please remember, when placed in a stressful position such as a fire, accident or crime, police officers are human and tend to revert to their training. Your increasing the stress on the officer only raises the potential for a bigger mistake happening to you.