No you still don't seem to get the point. I'm saying the *absence* of gunpowder residue means something, I'm not saying the presence of it means anything.

withinboredom seems to be making the similar but tangential point that, in the same way that absence of gunpowder is evidence [of something] while presence of gunpowder isn't evidence of anything, it's possible to demonstrate that a death was not by suicide, but it isn't possible to demonstrate that a death was by suicide. Same idea, but reversing "which part of the sentence is the variable".

I understand what they're saying, I just don't know why they keep explaining it when its irrelevant to what I'm saying.

If you fire a gun inside a car, both people and the car would be full of gun powder residue, not just the hand that shot - I think.

... and that should be the same residue.

I'm not "keeping explaining." I made a counter-point, and you redirected me to your point; I acknowledged that I got your point and explained I was making a counter-point, and you reiterated your point. I upvoted your final reiteration to ack that the conversation was over.