As federal agents sift through the case against the suspected jihadists in Willow Spring, North Carolina, it became clear that one man was missing from the conspiracy. Now federal authorities are scouring Pakistan for an 8th suspect in the alleged terrorist group. It is believed that the man (and, yes, it is most likely a man) has gone to Pakistan to gather intelligence. The story is startling as a reminder that terrorism can grow on American soil. Yesterday Attorney General Eric Holder warned that some Americans are becoming radicalized and turning to terrorism. Homeland Security Secretary Janet Napolitano then asked Americans to be alert for homegrown terrorists. But how do you recognize a radicalizing terrorist? Mitch Silber, Director of Intelligence Analysis for the New York Police Department, joins the conversation with his tips.