So in 20+ years we have 12 cases? And how do we know any of these cases are actually true? Because the people who benefit from wiretapping us claim it's true?

So in 20+ years we have 12 cases? And how do we know any of these cases are actually true? Because the people who benefit from wiretapping us claim it's true? The cases I follow have all been clear cut cases of entrapment (where the victim still went to jail!).