Oswald in the doorway: the blog of the Oswald Innocence Campaign, by Ralph Cinque

The most valuable thing about the Zapruder film is what it shows us about JFK's condition after he was shot, and his condition was appalling. Mentally, he was gone. He had no ability to talk or to communicate in any way. He had no awareness or understanding of what was happening to him. Obviously, if he did, he would have ducked and gotten his wife to duck. But, he did nothing. And physically, he entered a state of spastic paralysis in which he lost control of his muscles. He had no control over them at all as his spastic paralysis spread. 

What could have caused this? Let's consider his trauma. I won't waste a second discussing the ridiculous Single Bullet Theory. JFK's trauma was that he had a shallow wound in his back that affected no vital tissue. It was just a small puncture wound in the muscle and fascia. For all practical purposes, it did no harm to him at all. It was like a scratch.

Then, he had a shallow wound to his throat that did damage his trachea. It was serious but definitely recoverable. He would have needed surgery, but I suspect he would have been back on the job, to some extent, in a matter of days; less than a week. 

Neither trauma could have caused any mental derangement. And neither trauma could have caused him the neuromuscular degeneracy that we see in the Zapruder film. 

So, the physical trauma that Kennedy had received could not have caused the extreme degeneracy, both physical and mental, that we see on him in the Zapruder film. 

So, what could have caused such extreme derangement of his mind and his body and so suddenly? It had to be poisoning.  There is nothing else that could have done it. JFK was hit in the back with a poisoned ice flechette high on the hill. That is the truth, and it is not in doubt.