The National Research Council’s Report of the Committee on Ballistics Acoustics is issued. The study re-examined controversial acoustical evidence that allegedly included sounds of the assassination, as captured by an open microphone on a Dallas police motorcycle. The acoustics panel concluded that the acoustical impulses attributed to gunshots were actually recorded one minute after the assassination. Therefore, the panel found no evidence to support a second gunman on the grassy knoll.

Black and white photographic print of an investigator moving a microphone on Elm Street during the House Select Committee on Assassinations investigation. August 20, 1978. The Dallas Morning News Collection/The Sixth Floor Museum at Dealey Plaza. Donated by The Dallas Morning News in the interest of preserving history