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Report of the Committee on Ballistic Acoustics (1982)

Chapter: VI. POSSIBLE FURTHER STUDIES

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Suggested Citation:"VI. POSSIBLE FURTHER STUDIES." National Research Council. 1982. Report of the Committee on Ballistic Acoustics. Washington, DC: The National Academies Press. doi: 10.17226/10264.
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Page 33

Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

About this PDF file: This new digital representation of the original work has been recomposed from XML files created from the original paper book, not from the original typesetting files. Page breaks are true to the original; line lengths, word breaks, heading styles, and other typesetting-specific formatting, however, cannot be retained, and some typographic errors may have been accidentally inserted. Please VI. POSSIBLE FURTHER STUDIES 33 VI. POSSIBLE FURTHER STUDIES Our charter asks us to recommend the tests, analyses and evaluations needed to obtain better information from the recordings. If there were to be further studies of the Dallas Police Department Channel I recording in the hope of demonstrating the validity of the conjectured shot from the grassy knoll, the information listed in Appendix F should be sought. However, as discussed in Sections II and III, the evidence against the BRSW/WA conjectured grassy knoll assassination shot is already so strong that the Committee believes that the results to be expected from such studies would not justify their cost. use the print version of this publication as the authoritative version for attribution.

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At the time of the assassination of President Kennedy, the Dallas police recorded sounds from an open microphone; these sounds have been previously analyzed by two research groups at the request of the House Select Committee on Assassinations. Both groups concluded with 95% probability that the recordings contained acoustic impulses which provide evidence for the existence of a shot from the grassy knoll area of Dealey Plaza. On the basis of these results and since shots definitely were fired from the Texas School Book Depository, the House Committee concluded that "scientific acoustical evidence establishes a high probability that two gunmen fired at President John F. Kennedy."

Report of the Committee on Ballistic Acoustics studied these reports and the Dallas Police recordings on which they are based. This book reviews the methodology employed in the evaluations of the recorded acoustic data and of the conclusions about the existence of a shot from the grassy knoll. According to this report, the acoustic analyses do not demonstrate that there was a grassy knoll shot, and in particular there is no acoustic basis for the claim of 95% probability of such a shot. The acoustic impulses attributed to gunshots were recorded about one minute after the President had been shot and the motorcade had been instructed to go to the hospital. Therefore, reliable acoustic data do not support a conclusion that there was a second gunman.

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