I work in a large community hospital Emergency Center and I review medical records for disability claims at a nation-wide disability insurer. I also serve as a Deputy Sheriff on the SWAT team for a local county, as the medical asset.
The difficulty lies in piecing together the picture, which is indeed murky (that being part of the aim in covert dealings between tyrants and terrorist groups)--but rich enough in depth and documented detail so that the basic shape is clear. By the time Mr. Hayes is done tabulating the cross-connections, meetings, Iraqi Intelligence memos unearthed after the fall of Saddam, and information obtained from detained terrorist suspects, you have to believe there was significant collaboration between Iraq and al Qaeda. Or you have to inhabit a universe in which there will never be a demonstrable connection between any of the terrorist attacks the world has suffered over the past dozen years, or any tyrant and any aspiring terrorist. In that fantasyland, all such phenomena are independent events.