Criticism
Richard E. Sprague, an expert on photographic evidence of the assassination and a consultant to the HSCA, noted that the amateur film the HSCA relied on showed that there were no motorcycles between those riding alongside the rear of the presidential limousine and H.B. McLain's motorcycle, and that other films showed McLain's motorcycle was actually 250 feet behind the presidential limousine when the first shot was fired, not 120 to 138 feet. No motorcycle was anywhere near the target area.
The adult magazine Gallery published a flexi disc of the Dictabelt recording in its July 1979 issue. Ohio rock drummer Steve Barber listened to that recording repeatedly and heard the words "Hold everything secure" at the point where the HSCA had concluded the assassination shots were recorded. However, those words were spoken by Sheriff Bill Decker about a minute after the assassination, so the shots could not be when the HSCA claimed.
The Technical Services Division of the FBI studied the acoustical data and issued a report on December 1, 1980 (dated November 19, 1980). The FBI report concluded that the HSCA failed to prove that there were gunshots on the recording and also failed to prove that the recording was made in Dealey Plaza. In fact, using the techniques of the previous investigators, the FBI matched a gunshot recorded in Greensboro, NC in 1979 with the sound that was supposedly a shot from the grassy knoll - proving that the initial investigation's methods were invalid.
After the FBI disputed the validity of the acoustic evidence, the Justice Department paid for a review by the National Academy of Sciences, a U.S. corporation operating with a Title 36 congressional charter.
A panel of scientists headed by Dr. Norman Ramsey issued a report in 1982 which agreed with Barber and determined that there was no compelling evidence for gunshots on the recording and that the HSCA's suspect impulses were recorded about a minute after the shooting happened.
Dr. Barger, the HSCA's acoustics expert, when asked about this discovery and the NAS analysis, replied,
Barber discovered a very weak spoken phrase on the DPD Dictabelt recording that is heard at about the time of the sound impulses we concluded were probably caused by the fourth shot. The NAS Committee has shown to our satisfaction that this phrase has the same origin as the same phrase heard also on the Audograph recording. The Audograph recording was originally made from the channel 2 radio. The common phrase is heard on channel 2 about a minute after the assassination would appear, from the context, to have taken place. Therefore, it would seem . . . that the sounds that we connected with gunfire were made about a minute after the assassination shots were fired. Upon reading the NAS report, we did a brief analysis of the Audograph dub that was made by the NAS Committee and loaned to us by them. We found some enigmatic features of this recording that occur at about the time that individuals react to the assassination. Therefore, we have doubt about the time synchronization of events on that recording, and so we doubt that the Barber hypothesis is proven. The NAS Committee did not examine the several items of evidence that corroborated our original findings, so that we still agree with the House Select Committee on Assassinations conclusion that our findings were corroborated
Read more about this topic: Dictabelt Evidence Relating To The Assassination Of John F. Kennedy
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