The powerpoint from ROB appears to be a lecture or presentation he had put together for a medical school or some similar audience on the use and misuse of opiates. What if this happened? The McCann's were concerned about the previous complaints from neighbors to management about the kids crying. ROB offered to give Madeleine something to help her sleep, so the McCann's and ROB went to dinner before the main meal at the Tapas bar, and ROB provided medication for Madeleine into the food. The only thing that doesn't fit here, is WHEN did the McCann's know that Madeleine had died under this scenario? I can't see the McCann's going to dinner as if nothing had happened while ROB hid the body! I can see them going to dinner, and ROB returning to check on Madeleine, and finding her dead. Perhaps Kate and Gerry really didn't know Madeleine had died until latter; at which point, it would have been awkward to tell the truth. This would also explain the vomiting of ROB's child.....maybe she also received a dose that was too strong, and was vomiting, but was given an opiate antagonist to counteract the drug. Under this scenario, it would create a fairly tight bond for the McCann's and Russell O'Brien to cover for each other. Even though I can see it happening, it still seems far fetched - agreed? All of this of course, is my sad, fact-deprived mind grasping at straws.