As long as the pictures are taken from a public location, it's okay. I carry a copy of the Photographer's Right in my wallet. You can get a PDF of it here:
http://www.krages.com/phoright.htm "The general rule in the United States is that anyone may take photographs of whatever they want when they are in a public place or places where they have permission to take photographs." I encourage everyone to carry a copy of this to refer to in case they are confronted. Topher www.christopherpolack.com