Scip you ignore expert opinions in order to project your own agenda. Now, you question scientists at the highest level.
Having a silencer on a rifle does have an effect on whether drawback occurs, it makes it very unlikely to have occurred, especially as the shot to Sheila was not a direct contact head shot. The head bleeds profusely, compared to other parts of the body... 
This is further proof that you live in bizarro World. If you don't understand the reference:
http://en.wikipedia.org/wiki/Bizarro_WorldIt means you are declaring things to be the complete opposite of reality.
What expert opinions were presented? You presented opinions sourced to Holly- someone you or a different mod banned from this board.
It was not an opinion of an expert that drawback would be unlikely to occur if the murder weapon had the moderator attached but rather an opinion source to non-expert Holly.
She tried to support her claim by posting:
1) Pretending that only gases cause drawback though she already knew that was not the case because I proved she was wrong
2) asserting that the reduction in gas pressure would prevent those gases from being able to cause drawback though she had no source asserting such claim other than a source that sais moderators can impact it without going into how.
There were no opinions from any experts asserting drawback would be unlikely to occur just claims from Holly.
You are the one ignoring the experts.
The experts in this case actually looked at the wound in question and all relevant facts to whether the wound would result in drawback. The experts said it would have resulted in drawback. The defense found no experts to refute this nor did Holly.
I am being objective and following the evidence. You ate the one who is biased and thus choosing to ignore the expert testimony though you have nothing to challenge it beyond Holly's opinion which you have ridiculously elevated to expert status.