It’s long, but go read it anyway; here’s the final graf:

What we do know is that any useful information collected at the Black Sites has come at an enormous cost. The fact that “90 percent of the information was unreliable” and the rest is suspect is a problem. But a far greater problem is that, as a consequence of embracing the KGB model [designed to produce confessions, not information], we have made ourselves suspect and unreliable. The CIA’s secret interrogation program, like the lawless detention facility at Guantanamo Bay, is a major obstacle to any meaningful victory in the “war on terror.”