The enemy will give away 98 percent good intelligence to induce you to swallow 2 percent disinformation.
Monaco’s spymaster used to think the equation was 90-10.
Her Majesty’s Secret Intelligence Service corrected him.
“It is amazing what the Russians will give away just to get you to believe something they want you to believe,” he was told.
Hence, no matter how much truth emanates from a source, especially a defector, you cannot take for granted that all is true because of a source’s track record for veracity.
Everything must be validated.