Needn't be torture.
As others have pointed out, drugs can be used to break down their control. We'll have to sift through a lot of nonsensical babbling, but there are bound to be clues in there. Think of it as a core dump.
And then there are psychological methods. Something of a gray area there.
[link|http://www.angelfire.com/ca3/marlowe/index.html|http://www.angelfir...e/index.html]
Sometimes "tolerance" is just a word for not dealing with things.