User blog comment:Dryuuu/Why didn't Morgana tell Uther about Merlin poisoning her.../@comment-5674726-20121028203512

I'd say that the main reason why Morgana didn't tell Uther about Merlin poisoning her is that she must have known that, while her word would have been enough to have Uther send Merlin to the gallows without any further questions, Arthur wasn't going to be as easily convinced. He was bound to want to know why Merlin would want to poison her and, while Uther would have seen any allegation that Morgana had magic as a feeble attempt on Merlin's part to justify the attempted murder of his innocent ward, Arthur wouldn't forget the allegation and there was a risk that he'd keep an irritatingly close eye on Morgana and her actions afterwards – not a good thing for somebody planning to act as a spy.