The problem with incorrect transceiption exists with my secretary too. In the system I work in the secretary write my recordibg, sends it to me, I read it. I can edit the text at this point and then digitally sign it with a personal private key. This usually happens at least a day after being recorded. All perscriptions or orders to my nurses are given inannother system besides the raw text in the medical records. I can't easily explain the practical workings but I really don't see that the AI system will introduce more errors.
But I agree that in the event of a system failure, there will be a catastrophic situation.