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S1
Rapid Anthrax Test, Discovery’s Edge. Mayo Clinic Online Research Magazine (accessed December 2006). Available at: http://discoverysedge.mayo.edu/rapid_anthrax_test/

S2
Medical Laboratory Observer. The Observer, News: Polonium-210. (Accessed January 2007) PDF file available online at http://www.mlo-online.com/articles/0107/0107observatory.pdf

S3
Center for Disease Control and Prevention. Emergency Preparedness and Response, Information about Polonium-210 in Recent Events in the United Kingdom. (Online information, accessed January 2007). Available at: http://www.bt.cdc.gov/radiation/isotopes/polonium/qa.asp

S4
CDC. Emergency Preparedness and Response, Bioterrorism Agents/Diseases by category. (Online information, accessed February 2007). Available at: http://www.bt.cdc.gov/agent/agentlist-category.asp#a