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.
What was it they were testing?
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I"m sorry, I know I posted an answer to this question but apparently it disappeared into cyberspace. As far as I know, no, it wouldn't be possible. The DNA results would show a mixture so that you could say 'it could be a mix of these two people, meaning there's no alleles that could NOT have come from them' but you couldn't positively state that it is a mixture. And it wouldn't be possible to tell which came first as the sample is put in a liquid medium and mixed to analyze.
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That’s an exceedingly broad question that could take a stack of textbooks to answer.
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But what sample were they testing? What piece of evidence were they analyzing in the gas chromatograph?
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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.
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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.
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No.
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