Volume VIII of the HSCA's Appendices contains the reports on the acoustics evidence (using a recording made from a police motorcycle with its microphone stuck open), as well as reports on fingerprint and handwriting evidence. The HSCA's acoustics findings became the main scientific basis for its "probable conspiracy" finding. The analysis was subsequently disputed by a panel appointed by the National Academy of Sciences, but this rebuttal itself has been recently challenged by scientist D.B. Thomas in an article published in Science and Justice.