Because you'd have reports by crowns or police. And I'm not talking about people who get off on a technicality. I'm talking about people to whom the judge has said, “I believe you are not guilty.”
Where's the suggestion that people are coming before you and saying that we have 200 cases of factually guilty people who were allowed to walk away on the basis of the judge shouldn't have believed them? Unless you find that, you just shouldn't fix it.
As my grandfather used to say, don't fix it if ain't broke. This part isn't broke, so don't fix it.