Re: news article: BC Judge questions latent prints
Posted: Tue Nov 05, 2013 8:21 am
Thanks Steve E. for posting the prior threads. I had a nagging sense this had come up before.
The jury, or the judge in a bench trial, is the fact finder. They decide the ultimate question -- has the prosecution proven beyond a reasonable doubt that the defendant is guilty. That usually means making a bunch of underlying decisions about witness credibility and expert testimony. In a jury case, this happens in the mysterious black box of the jury room -- all we get is the verdict and we don't know if the jury understood the expert testimony, never mind whether they accepted or rejected it. In a bench trial, the trial judge often gives findings, either written or oral, that explain some of the reasoning.
I'm not disagreeing with you Timbo, that jurors aren't LPEs. One of the threads Steve E mentioned talked about juror examination of exhibits and experts who are on the jury. But they are the fact finders -- they get to accept or reject any testimony and give it whatever weight they see fit. If the jury doesn't understand your testimony, looks at the exhibits and doesn't see what you described, they could reject it or give it a weight of zero.
Courts often require experts to at least provide detailed reports to the other side. A couple of years ago, the Mass Supreme Court wrote:
In a Daubert/Frye hearing, judges will want to see the documentation and may raise questions if they can't see what it is the expert is describing. (This had been an ongoing problem in firearms ID cases where it was rare for photos of the comparison to be taken, never mind introduced.) I haven't yet had a case with a picture of a firearms ID match, but it takes a while for a case to make it to an appeal. At trial, the comparison materials may come in either in direct or cross if someone thinks there's a good tactical reason to put it in. Once it is an exhibit, it goes to the jury room and they can do whatever they want with it -- jury room is a black box we don't poke into.
The jury, or the judge in a bench trial, is the fact finder. They decide the ultimate question -- has the prosecution proven beyond a reasonable doubt that the defendant is guilty. That usually means making a bunch of underlying decisions about witness credibility and expert testimony. In a jury case, this happens in the mysterious black box of the jury room -- all we get is the verdict and we don't know if the jury understood the expert testimony, never mind whether they accepted or rejected it. In a bench trial, the trial judge often gives findings, either written or oral, that explain some of the reasoning.
I'm not disagreeing with you Timbo, that jurors aren't LPEs. One of the threads Steve E mentioned talked about juror examination of exhibits and experts who are on the jury. But they are the fact finders -- they get to accept or reject any testimony and give it whatever weight they see fit. If the jury doesn't understand your testimony, looks at the exhibits and doesn't see what you described, they could reject it or give it a weight of zero.
Courts often require experts to at least provide detailed reports to the other side. A couple of years ago, the Mass Supreme Court wrote:
Com. v. Heang, 458 Mass. 827 (2011).“before trial, the examiner must adequately document the findings or observations that support the examiner's ultimate opinion, and this documentary evidence, whether in the form of measurements, notes, sketches, or photographs, shall be provided in discovery, so that defense counsel will have an adequate and informed basis to cross-examine the forensic ballistics expert at trial.”
In a Daubert/Frye hearing, judges will want to see the documentation and may raise questions if they can't see what it is the expert is describing. (This had been an ongoing problem in firearms ID cases where it was rare for photos of the comparison to be taken, never mind introduced.) I haven't yet had a case with a picture of a firearms ID match, but it takes a while for a case to make it to an appeal. At trial, the comparison materials may come in either in direct or cross if someone thinks there's a good tactical reason to put it in. Once it is an exhibit, it goes to the jury room and they can do whatever they want with it -- jury room is a black box we don't poke into.