It was reported that whatever that was, it wasn’t the taser. I wish they would release all the information. By now we have seen what having only a part of the facts leads to.
But it's illegal to drop, or move evidence of any kind at a crime scene.
Surely you've seen the little yellow evidence markers in photos of crime scenes that indicate where everything *was* at the time of the shooting.
http://www.abc.net.au/news/image/1324406-3x2-940x627.jpg