From photography blog Ambient Light, a set of legal guidelines for photographers. Click through to see the whole guide.

You can not be fined or charged by a private citizen, property owner, or security guard, but they have every right to sue you if they believe you have done damage to them.

Nobody can threaten to destroy your camera, lenses, film, other property, nor can they threaten you with physical harm. Nobody can actually destroy your property, forcibly delete photos, expose your film, or harm you.

Police can not interfere with your lawful enjoyment of property.

Nobody can force you to delete photos. They are your private property, and willful destruction of private property falls under the Criminal Mischief.

Nobody can search you, your bags, car, etc. However, being searched may be a condition of entrance to private property or an event.

Spotted on @OpenFile (http://twitter.com/Open_File/statuses/16857510209)