Did torture work? This is the question everyone is asking after Osama bin Laden's death and the revelation that his fate was sealed by the identification of a courier whose nom de guerre emerged from the interrogation of top al Qaeda operatives who were known to have been subjected to waterboarding and similar techniques. "Did brutal interrogations produce the intelligence that led to the killing of Osama bin Laden?" a May 3 New York Times story asked.

This is hardly the first time we've had this debate. In 2006, my team of interrogators in Iraq located local al Qaeda leader Abu Musab al-Zarqawi by identifying and following one of his spiritual advisors, Abu Abd al-Rahman. Eric Maddox, a U.S. Army interrogator, found Saddam Hussein by similar means, identifying his former bodyguards. It's these little pieces of information that form the mosaic that gradually leads to a breakthrough. But how best to get those little pieces?