jmortimer said:
...I think the Judge was wrong regarding the evidence even though I think Bias was guilty. You will not get uniform rulings say in a case from New Jersey and one from Montana.
[1] Actually, the judge in New Jersey in
Bias was probably correct not to admit the defense GSR test results. In general under the rules of evidence in pretty much every jurisdiction, expert opinion based on scientific tests requires a very solid foundation establishing a close nexus between the test and a material issue in the trial.
[2] And yes, I would expect similar rulings in New Jersey, Montana, and elsewhere on this sort of issue. The rules of evidence are pretty similar from jurisdiction to jurisdiction, and the hurdles that must be gotten over to get into evidence expert opinion testimony based on scientific tests will be pretty much the same everywhere.
Pvt. Pyle said:
Comparing an accidental discharge/murder/suicide whatever you want to call it is a whole different thing in self-defense. When pulling a gun in self-defense you are deliberately firing live rounds at an attacker posing an imminent threat....
Those different types of cases really aren't different at all, at least not with regard to the legal rules for introducing into evidence expert opinion testimony based on GSR testing.
Let's have a look at a hypothetical illustrating how expert opinion based on GSR test results could become material to the defense in a self defense case.
You shot someone. You claim he was attacking you, that a reasonable person would have been afraid for his life, and that you were therefore justified in using lethal force in self defense. The DA disputed your claim of justification, charged you and brought you to trial. You will need to establish that a reasonable person in like circumstances would have concluded that the person you shot was a genuine threat. His distance from you at the time you shot could be one factor.
GSR test results could be part of the equation and also important corroboration for your story and why the person you shot was a threat. For example, there could be a dispute about your distance from the target when you shot. You say you shot your alleged attacker when he was 6 feet away. A witness (or even your alleged attacker who survived) claims the alleged attacker was 20 feet away. Now a witness can be mistaken about such things. It could be a matter of angle. It could be that the witness has lousy skills for estimating distance. Or it could be the fact that we know that witnesses can suffer from the same stress induced perceptual distortions as participants.
If you can introduce an expert's opinion based on GSR testing that supports your story about the distance at which you shot your alleged attacker, it will add credence to your testimony. The jury will be more likely to accept your testimony, and you will therefore be more convincing to the jury. And by establishing the proximate of the assailant at the time you shot him, you help establish that he was reasonably a bona fide potentially lethal threat. But doubt regarding your story will damage your overall credibility.
But if you used handloads, you will most likely not be able to introduce such expert testimony into evidence because you will not be able to adequately satisfy the judge that the ammunition tested by your expert was the same as the ammunition you shot your assailant with.
Sarge said:
...To me, this has murder written all over it. I take exception to the notion that 'reloads' are what did this guy in....
But for our purposes, whether or not Daniel Bias was guilty is irrelevant.
What is relevant for our purposes is that in
Bias the trial judge, applying common evidentiary principles, would not allow Bias to introduce into evidence his own expert's testimony based on his expert's GSR testing of ammunition that Bias claimed was the same as the "death round."
And the judge refused to allow the testimony of Bias' expert because, since the ammunition was handloaded, the judge did not find that Bias had established an adequate foundation, i. e., Bias' claim was not sufficient to establish that the ammunition Bias' expert tested actually matched the death round.