How Did Edgar Casey Fail on Atlantis and Egypt?

The health readings look like they have more credibility than the others in which edgar casey often failed, spectacularly. One possibility is that he just had a psychic knack in one area, but not in others. Another possible is that he was the subject of telepathic overlay, as it's called in the remote viewing community. And those telepathic impressions might overlay the results he gets, introducing error.