I've previously read accounts of photographers being harassed. This smart guy turned on his camera's video function and recorded the outrageous conversation with a security guard. She was pleasant, but instructed him about a "policy" that is utterly bizarre (because this policy, to my knowledge, doesn't really exist in the law). Keep in mind that, according to this security guard, it's illegal for a tourist to snap any photos of the historic buildings in Washington D.C. without special clearance. I'd like to reserve this post as a place for anyone else to post comments if they or someone they know has been warned to not take photos in public spaces, prevented from taking such photos or had their camera(s) confiscated.