There's been a lot of back and forth since then. One guy claimed to hear words among the "shots" referring to "homicide," indicating these sounds came from AFTER the assassination.
Another survey showed that these words were pasted from elsewhere, and that the shots COULD have been from about the time of the murder.
Either way, ya can't argue with the fact that ONLY people with government access could have muddied the medical, physical, and photographic evidence. SHAME.