A couple things that didn't fit anywhere else on this topic:
From the footnote to page 9 of the 46-page May 10, 2005 Bradbury memo:
13 In Interrogation Memorandum, we also addressed the use of harmless insects placed in a confinement box and concluded that it did not violate the statute. We understand that--for reasons unrelated to any concern that it might violate the statute--the CIA never used that technique and has removed it from the list of authorized interrogation techniques; accordingly, we do not address it again here.
1. Is that true? Did CIA really never try this?
2. Why not? Did someone have a fit of conscience? I think there's a story worth knowing here.
From the same memo page 13, section 13 on "the 'Waterboard'" (the numbering is quite appropriate):
[...]In addition, you have indicated that the detainee as a countermeasure may swallow water, possibly in significant quantities. for that reason, based on advice of medical personnel, the CIA requies that saline solution be used instead of plain water to reduce the possibility of hyponatremia (i.e., reduced concentration of sodium in the blood) if the detainee drinks the water.
3. Just how much water are we talking about here? CIA is clearly talking from experience here. It takes a very large amount of water to induce hyponatremia. Litres, I would imagine. I take this as a sign that OLC knew just how barbaric this practice was - the detainee might die of over hydration.