A Dictabelt recording from a microphone stuck in the open position on a motorcycle police officer's radio in the vicinity of the assassination of John F. Kennedy on November 22, 1963, has been used as evidence related to the assassination. The recording, made on a common Dictaphone dictation machine that recorded sounds in grooves pressed into a thin plastic belt, gained prominence among Kennedy assassination conspiracy theorists since 1978, when it was the only piece of evidence that prompted the House Select Committee on Assassinations (HSCA) to conclude that there was a "high probability" that Lee Harvey Oswald did not act alone and the Kennedy assassination was the result of a conspiracy. Later scientific examination discredited this interpretation of the evidence.