If we're talking the UBS case that others have alluded to here: He went to jail because he didn't tell the whole story and tried to cover up his part. Whistleb

If we're talking the UBS case that others have alluded to here: He went to jail because he didn't tell the whole story and tried to cover up his part. Whistleblowing rules require full disclosure of your information to prevent them just being used to take out rivals; by covering up his part in the illegal activity, he forefeited part of his protection and so is in prison. This is normal and perfectly fine.