Actually, David, re: Arnett and the Operation Tailwind story (CNN alleged it was a mission to kill American defectors in Laos and allegedly sarin was used), the story's producers were fired from CNN when the story blew up (and it did appear to me that they did use some questionable editing and persented their assumptions as fact to present the story they wanted in the piece). But Arnett, who first was a proud member of the team but later distanced himself by saying he had nothing to do with the story but a voice over and the use of his name, stayed on with CNN. His contract later was not renewed. Not quite the same as being summarily fired. For someone who had nothing to do with the CNN piece and just read a script, as he later said, he nevetheless had a companion article under his name in Time magazine which evidently was not his reporting. When it blew up, he was just a bystander, not an investigative reporter. Seemed shoddy journalism to me, although no doubt many "reporters'" pieces are basically some unseen producer's work.
As for what else may have happened in Laos, I don't claim to know. But I thought much less of Arnett after that episode and how he was quick to first take credit for a piece and later wipe his hands of it and his colleagues.