J. Edgar Hoover: "The evidence that they have at the present time is not very, very strong."
J. Edgar Hoover: "The case, as it stands now, isn't strong enough to be able to get a conviction..."
So, we have J. Edgar Hoover in his own voice and words admitting that the evidence and case against Lee Harvey Oswald is "not very strong" and "isn't strong enough" to get a conviction.
The evidence against Oswald should have been overwhelming if he was indeed the lone assassin, but here we have Hoover in a private moment admitting there is no strong evidence against Oswald to even convict him.