David Coleman Headley: The Perfect Terrorist?
Clip | 4m 40s
His U.S. passport made him "a dream come true" for Lashkar-i-Taiba, the Pakistani group behind the 2008 attacks in Mumbai. But having been caught smuggling drugs, Headley also worked as an informant for the U.S. Drug Enforcement Agency. "He just turns around immediately and betrays everybody when it's convenient for him," says one terrorism analyst.