How many shots did the acoustic experts claim were fired during the Kennedy assassination ?
McLain asked the Committee , " ‘ If it was my radio on my motorcycle , why did it not record the revving up at high speed plus my siren when we immediately took off for Parkland Hospital ? ’ ” In 1982 , a panel of twelve scientists appointed by the National Academy of Sciences , including Nobel laureates Norman Ramsey and Luis Alvarez , unanimously concluded that the acoustic evidence submitted to the HSCA was " seriously flawed " , was recorded after the President had been shot , and did not indicate additional gunshots .