All prisoners are entitled to be kept under reasonable basic conditions, and that includes adequate sleep, food, clothing and shelter.

Any interrogation or questioning has to be consistent with that. Once you authorise stepping over that line, you inevitably end up with the kind of nauseating stuff we've been hearing about. Except normally we don't hear about it, because the photographic evidence isn't there to attract attention. Detailed allegations like this have been around for a longtime, but they have been ignored, because it's easy to ignore allegations from people who claim to have been tortured and abused.