LIsa Black
Cape Coral, FL
Female, 49
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.
I'm sorry, but again that is way too broad a question. Most forensic science is based on biology, physics and chemistry, so it's all 'natural' science.
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32. It was my second career, I majored in political science during my first round at college and was a personnel secretary for ten years first.
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That determination is made by the pathologist doing the autopsy, and there are a number of ways--body temperature, rate of decomposition, rigor mortis, but it will be an estimate, not the precise number that you might see on TV. All those things can depend on the environment where the body is, temperature, exposure, physical characteristics of the victim, medical conditions etc. Entomologists can help if there is distinct bug activity at the scene as well.
Hope that helps!
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Contamination may make it impossible to get a DNA profile, or the profile might show a mixture. It will not cause a profile to look like someone else's DNA. Or it may have no effect at all. It depends what is contaminated with what.
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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!
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Most people are cross-trained in more than one area. In smaller agencies people might have to wear a lot of hats.
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I’m sorry, no. I don’t feel qualified to do that.
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