Remember the color coded threat system? The often-spoofed and much-maligned system was designed by the U.S. Department of Homeland Securtiy after 9/11 to warn the public of future terrorist attacks. Michael Chertoff was in charge of running that system for the entire country for four years. The former Secretary of Homeland Security joined Security Mom to talk about what we can learn from that failure and the ways we communicate and understand risk.