Sam1911
Moderator Emeritus
I understand that I'm not a lawyer and sometimes the answers to these questions really, legitimately, and maybe even appropriately ARE that if you're not a lawyer you just can't comprehend how the system works. Setting that aside, for the moment...
Are there cases where handloaded ammunition needed to be used this way and WAS refused admission into evidence? I understand the technical theory about the rules of evidence by which it could be refused, but HAS it been?
And that's where the question runs into trouble, I think. If all .45ACP cartridges produce roughly "X" GSR pattern and density at 0-5 feet and "Y" pattern and density at 5-10 feet, and "Z" pattern and density at 10+ feet (after which there's really no pattern to detect), then the cartridge doesn't have to be an exact match to produce relevant observable data. And even factory cartridges out of the same box aren't going to produce exactly the same pattern such that a technician can narrow the range down much below rough distances anyway. So it would be incorrect to say that a technician could not produce a true opinion based on testing even roughly similar loads. Now can that be admissible? As you said, that's up to the judge. The "easy" answer would be "no." The educated answer would seem to be "yes." It would probably be up to the defense to show the judge that the data collected was acceptably similar.The basic rule of evidence regarding the admissibility of expert opinion based on a scientific test is that it has to be relevant. In order to be relevant, a sufficient nexus between the test and the subject matter of the litigation must be shown -- in other words, the thing tested must be established to the satisfaction of the judge to be the same as the thing at issue in the litigation.
Why would that be? Ammunition recovered from the magazine, matching the spent case on the ground, and matching other loaded ammo taken into evidence from the shooter's home would certainly be testable, and tested, and would produce results which would be very substantively similar to the round(s) fired. As pointed out previously in other threads, investigating agencies DO take such into evidence, and DO test it, and DO use their findings in trials.If the thing tested is a cartridge, the party submitting the opinion based on the test has to show that the cartridge fired in the test was the same as the cartridge fired in the incident that is the subject of the litigation. When handloads were used, the only way to connect the cartridge tested to the cartridge fired in the incident is the defendant's claim.
Are there cases where handloaded ammunition needed to be used this way and WAS refused admission into evidence? I understand the technical theory about the rules of evidence by which it could be refused, but HAS it been?