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Well, the "proofs" that they are fiction is fairly complex and technical, and because we are dealing with liturature and academic issues here we aren't talking about "hard proofs", but a 'preponderance of evidence' type of proof.
Some of the arguments are 'technical' - such as the fact that you can't effectively smoke mushrooms to get a psychedelic experience, and that the mushroom recipe described in the book is nonsense, and doesn't work. And the Datura recipe described is a copy of the western european witches ointment recipe, and that no similar "ointment" use of daturas has ever been described by anthropologists and ethobotanists who have done well documented and accepted studies of psychedelic use in mexico and central america.
And, descriptions of certain events in the books were taken nearly verbatim from at-the-time unpublished writings from other anthropologists. The best known example of this is the "shaman jumping from rock to rock" scene, taken from Barbara Myerhoffs writings which were later published in her excellent book about peyote use in mexico.
In order to really understand the evidence that the books are fiction, you need to do the reading and background study about how the books were written, why they were origibnally accepted as a masters thesis and doctoral thesis, who Castenada's Academic advisor was, and how these books compare to later studies which have been accepted as quality research into the actual use of psychedelics and the religious and shamanic traditions of the tribes in that area.
It's all a fascinating story really.
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