Personally, I think it looks like Bubaris did it, but I wasn’t there, and I would like to hear more evidence. It certainly was enough for a grand jury to hand down an indictment, and the DA isn’t a flaming lib (even though she’s pro-abortion and not in the Scalia mold of enforcing the law.)
I’ve heard it said that a grand jury can convict a ham sandwich, the level for evidence is so low.