The article says "there is evidence" that the Duke of Buckingham poisoned the sons of the Earl of Rutland but framed the witches. But it doesn't say anything ab

The article says "there is evidence" that the Duke of Buckingham poisoned the sons of the Earl of Rutland but framed the witches. But it doesn't say anything about what evidence. It is not clear if this is just speculation or if someone really did solve a 400 year old murder case.