You might note that, as I understand it (and I'm ,fortunately, no expert in this area), torture is of no value in obtaining useful information.
Think about what a person will do to avoid severe torture. They'll make up "information" and say most anything. If they do know something you might get some accurate information mixed in there but you don't know which is which and if you have someone who really doesn't know anything it is all made up.
Edited by NosyNed, : spelling error