Since this has been brought up in several threads I figured I'd ask the question. What would be the best course of action when asked to stop photographing and delete your pictures when dealing with a security guard? What would be the best course of action when dealing with a Police officer (assuming you clearly have the right to shoot)?
OK, for the first: "I'm sorry but under the law, all you can do is ask me to leave the property, is that what you wish?" Most security guards know, that if they touch someone, they can face an assault charge. Lay charges against the security firm, if anything serious develops.
As to the police officer it depends on the situation. A photographer cannot appear to be loitering or impeding pedestrian traffic, for example, and in some jurisdictions it is felt that if you are using a tripod on the street, you should have a permit from the city, like movie companies for example. That does not mean you are forbidden from taking photos, but you would be required to move along, or possibly pack up the tripod.
In dealing with a policeman, it is useful to have a business card and to politely explain why you are interested in taking a photo of ..whatever.
"I am not aware that I am breaking any laws. Is there a problem?" What he says at that point determines your reaction. Be aware that taking photos is not illegal in a public place or on private property, so you cannot be arrested for taking pictures. Also a warrant is required for a policeman to touch your equipment (You have heard of the term unauthorized search and seizure) and that requires an arrest that relates to your photo equipment. Impossible because as I said, taking photos is not illegal.
It is covered under Freedom of Expression in many countries.
skieur