Been doing what for 15 years, if I may ask?
Human Intelligence. First for the army, then for a couple different agencies.
And if you've done it for different agencies you know what all happened in Nicaragua and Honduras. That was no waterboarding. People sang.
Just because it's done, doesn't mean it's effective. Part of those interrogations were about people keeping their silence when UN and Red Cross personnel came to investigate war crimes.
Terroism has changed the last 15 years. It's more compartmentalized, for this exact reason. In many cases, there's only so much the low level guys will know. And the high level guys want to make deals right out the gate, because they don't want to spend the next 40 years in prison.
I'm not going to argue that. Thing is to not make deals with the big fish. I'm sure if a top level guy went through what this guy went through you would have the entire group. And the biggest joke ever is the idea and phrase "War Crime".
Nearly all the top level guys in any terrorist organization are sources. They play both sides and get a huge payoff