My daughter was working for the Post Office during the Anthrax scare during the 2nd Bush administration. They treated EVERY powdery substance as a possible anthrax event. They really hated it when detergent samples broke open.
I hear that. I have a friend who worked at the main post office in Dallas during that anthrax scare. He designed a t-shirt and wore it to work. It had to do with a canary in a coal mine. I still have one around here somewhere. ;o)