Photography student's odd run-in with Homeland Security

Seattle-based blogger and photogger Ian Spiers says:

About a month ago I had a little run-in with 3 Homeland Security agents, 3 Seattle Police officers, 2 security guards and a German Shepherd while I was at a local park with my camera. The DHS agent told me that it's illegal for me to take pictures of federal property. The ACLU of Washington disagrees. My blog is my attempt to chronicle this outragous situation and bring some common sense and public awareness to it.