Funny coincidence that just a few hours after seeing your post here, I came across this article about how CBS went about interviewing Orville Nix.
I don´t believe CBS was part of a conspiracy to twist the words of the witnesses. It´s just interesting that even so, that is what they did. They twisted the statements of Orville Nix.
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"When interviewed by CBS about what he witnessed, Nix stated he heard shots coming from the direction of the grassy knoll. They would then say to him “Cut!” each time he answered. Finally, they asked him what the Warren Commission said about the shots. Nix stated, the schoolbook depository building. When they edited the tape for broadcast Nix is saying he heard the shots coming from the schoolbook depository building. His original statement had been cut out! Nix always maintained he heard shots coming from the grassy knoll.
What CBS did here is completely unethical and outrageous. When there was only three networks this type of deception was a piece of cake. CBS producer Bernard Birnbaum, who worked on the documentary, denies any of this happened to Nix. As he said, "We never tried to put any words in anybody's mouth, absolutely not." I believe Birnbaum is a liar. After all, somebody edited the tape, right? If we could see the unedited version the lie would be exposed, thus modifying Nix’s original testimony as to what happened. Nix always maintained he heard shots coming from the knoll. His honesty in this is assured.
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There would be a replay of this in the early 1980’s when Jim Garrison was interviewed for Speak Up America TV program. Executive Producer George Schlatter made sure the tape was edited to have Garrison saying there were “32 shooters” in Dealey Plaza. Originally he had been asked how many people were involved in conspiracy. Garrison answered thirty-two. Supervising producer John Barbour (see his excellent documentary interviewing Jim Garrison HERE.) asked Schlatter why he did this and he replied, “Garrison is a nut.” "
http://oswaldsmother.blogspot.com/2009/07/how-cbs-screwed-orville-nix.html