I spent the five happiest years of my life in a morgue. As a forensic scientist in the Cleveland coroner’s office I analyzed gunshot residue on hands and clothing, hairs, fibers, paint, glass, DNA, blood and many other forms of trace evidence, as well as crime scenes. Now I'm a certified latent print examiner and CSI for a police department in Florida. I also write a series of forensic suspense novels, turning the day job into fiction. My books have been translated into six languages.
But what sample were they testing? What piece of evidence were they analyzing in the gas chromatograph?
I have never done an autopsy, as I’m not a doctor. I’ve attended many, many autopsies, and they generally take about two hours, but can go up to four or five if there are a lot of injuries. At that point they will be done with the body, but the autopsy report can take much longer depending on if they have to send out samples for toxicology analysis (most places do) or have to wait on some other kind of specialty report. In one case I remember we had to wait a long time for a pediatric x-ray analysis. That can be weeks to months depending on who you’re waiting on and how big their backlog is.
Biology would help with the natural fibers (like cotton or fibers from plants, or hairs from animals like wool) and chemistry helped with analyzing synthetic fibers with polarized light or fourier transform infrared spectroscopy. Those last two don't work on natural fibers because they're not consistent all the way through like a synthetic fiber, that comes out of a machine.
Fiber analysis was usually only examined in cases of stabbing, strangling or bludgeoning, where there had to be close physical contact between victim and suspect. (A gunshot didn't mean there had to be contact.) It was only a small part of my days. Very little is done any more because you can only say the fibers are consistent with having come from a particular sample, you can't say they did, as in DNA or fingerprints. You can't even give a statistic for how likely it would be to find a particular fiber unless it came from the suspect, etc., because we can't know how many items with that fiber are in the environment.
Only collection would be done in the field, to do anything more you would need the microscopes and the equipment at the lab.
Hope that helps!
I'm sorry but I have absolutely no idea. You might call the labs at which you'd like to work and ask about the positions you'd like to get, and see what they suggest. They would know a lot more than I would.
Best of luck!
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Sorry, but I really don't know. You'd have to ask a pathologist. I imagine it might depend on how long after death the person was in the water.
As far as I know, no. The DNA tests of the shirt will just show a mixture of the victims, so that the analyst would only be able to say the blood could have come from these two or three people--in other words there are no alleles that definitely couldn't have come from those three. But because it is a mixture, they can't say it did come from these three exact people. And they couldn't tell, again as far as I know, which blood was deposited first.
I’m sorry, no. I don’t feel qualified to do that.
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