Posted by 357 Terms: I don't think a DA would look at a SD shooting in the same light.
If the DA believes that the shooting involved self defense, the case will not go to court.
If it is also present in reloads why wouldn't the data be admissible?
That's a good qustion. I'll try to address it clearly.
A finding that GSR was or was not detected on a person who has been shot
is admissible; such evidence (the presence or lack of GSR on the victim) will have been gathered by the police investigators, and if there is reason to do so, it will be introduced by the state, along with whatever conclusions the prosecution might like to infer from the evidence.
That's what happened in the Bias case, not that it affects anything here. The investigators initially believed that Mrs. Bias committed suicide, but they decided differently when tests of factory loaded cartridges of the same type showed GSR would surely have been present on the victim had the shot been fired within arm's length.
The issue arises when and if (1) the ammunition used by the defendant would not have deposited GSR on a victim at the distance the prosecution's witnesses claim the shooting occurred, when GSR was in fact detected on the victim, or (2) the pattern that the defendant's ammunition would have made at the distance claimed by witnesses differs from markedly what was observed and the prosecution draws an erroneous conclusion from the SR pattern on the victim.
In such cases, the defendant would be well served by having an expert introduce the results of testing of the ammunition actually used.
That's where the rules of evidence we have been discussing enter the picture.
If the defendant who wanted to introduce such test results had used factory ammunition, and if the prosecution were to challenge the results of the defendant's testing were not reliable indicators of the ammunition used, the defendant's attorneys could subpoena the representatives and records of the manufacturer, who would then show how the in-process manufacturing data and lot acceptance test data for the ammunition in question had been prepared, used, and maintained in accordance with ISO standards and had been maintained and safeguarded by independent custodians in secure conditions. The challenge would fail. For that reason, data from factory loads are unlikely to be challenged by the prosecution. Whether or not there is a challenge, the data will be admitted as evidence.
The key words here are
maintained and safeguarded by independent custodians in secure conditions. If the records pertaining to the exemplar ammunition used in the defendant's testing had
not been maintained where they could have been tampered with, and particularly if they had been at any time in the control of someone with a possible motive to do so (such as the defendant in a murder case), the test results would not be admissible under the the rules of evidence.
I hope that answers the question adequately.
What it boils down to after that is a matter of judgement. One may conclude that it is very unlikely that a case will ever hinge upon the admissibility of test data. That's probably true,
most of the time. But if it does, the effect on the outcome could be severe. It costs very little to mitigate that risk.
For that reason, I carry factory ammunition. I will say that if I had embarked on a camping trip and remembered later that I had inadvertently brought along only handloads, I would most probably not turn around to go home to get factory loads or take an lengthy detour to try to find some.
The name of the game is risk management.