Bob_the_lost said:If for example, he said that he stored the plans for an attack in a bank vault in Switzerland then it'd be possible to locate, retrieve and confirm his story. If he were to give details about how the identities of the hijackers were fabricated (if they were) and the methods used in a level of detail that the average terrorist would not be able to do so then it confirms his involvement in that phase.
And suppose that the interrogators already had this information from elsewhere, and wanted to implicate their suspect in the associated crime, then they could coerce him into 'providing' this information, and bingo! job done.
You would then say that only a guilty man could have provided the information, so you're convinced of his guilt.
Forgive me, Bob, but I think you underestimate how devious this process can be.