Since 9/11, there’s been an incredible number of incidents where photographers are being interfered with and arrested for doing nothing other than taking pictures or recording video in public places.
It’s not just news photographers who should be concerned with this. I think every citizen should be concerned.
Mickey H. Osterreicher, general counsel, National Press Photographers Association. New York Times Lens Blog, Criminalizing Photography
Professional and non-profressional photographers need to know their rights.
If you want to jump straight into the details, the ACLU writes about photographer rights here.