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.
Gunshot residue can actually refer to two things, gunpowder that flies out of the barrel with the bullet and can land on the victim, and primer residue that can leak out of the back of the bullet cartridge and spray out onto the shooter's hand. But it can also get on the gun or nearby surfaces or people so presence of it on hands does not prove someone fired a gun, and it can wipe off easily so absence of it doesn't prove they did.
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I'm sorry but I wouldn't have any idea. They didn't even have forensic science degrees when I went to school.
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Generally bodies in the water decompose more slowly than bodies exposed to air, but more specifically than that I cannot tell you. I did find this: https://digital.library.txstate.edu/handle/10877/4078
It's really a pathology question and not my area. Also colder temperatures will cause slower decomposition than warmer temps.
I definitely can't answer your second question but also, are you asking a) how long the person lived as a sailor b) how long the person was in the water before the hand was cut off or c) how long they might have survived in the water after the hand was cut off (assuming they had no access to a tourniquet and such like)? If you could locate someone who worked as a ship's doctor they might be a big help.
Best of luck!!
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Get everybody out of it, and then take pictures.
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At a guess, I would suggest: slash marks that are too wide for a knife, some partially healed, would indicate animal claws inflicted at different times, but none deep enough or near vital arteries to cause bleeding out. Then water in the lungs would indicate drowning, though that is not always a definite indicator. Drowning is an elimination diagnosis, as in you eliminate other possible causes.
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As I am not trained in accident investigation, I wouldn't have any idea.
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