Former Congresswoman and prosecutor Liz Holtzman makes a good point:
The criminal justice system identified and convicted some of those involved in the 1993 World Trade Center attacks. By contrast, not one person has been prosecuted for the 9/11 attacks, although seven and a half years have gone by. Even Khalid Sheik Mohammed, one of the masterminds of 9/11, is unlikely ever to be convicted in US courts because he was repeatedly subjected to torture. Significantly, the cruel and torturous methods used on detainees never yielded enough information to capture Osama Bin Laden or his chief deputy. So much for the claims of torture’s efficacy.