Top secret memos

have just started reading the actual Top Secret memos about the CIA Enhanced Interrogation Techniques. These memos would seem to be written after the events have actually taken place, especially the ones dated May 2005. These are retrospective memos to justify what has already been done. The CIA surely cannot avoid prosecution the action they took predates the memos accordingly they did not know that the advice they would receive would exonerate them from their activities, or if not actually exonerate them at least lead to an executive decision that they would not be prosecuted.