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.
No. There is no time stamp on DNA, so far as I know.
If someone is under a doctor's care and the doctor signs the death certificate, then there most likely will not be any examination at all. Autopsies are not done in every case, only under some circumstances. Any examination would be done at autopsy.
How to best process or obtain a piece of evidence.
If you're going to be a DNA analyst, you will probably not be working with gunshot residue as well. DNA labs are tending to want their analysts to have a PhD in genetics and focus solely in that area, but it would be best if you called labs at which you might want to work and make sure. Best of luck.
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I'm sorry but I have no idea. That's a question for a pathologist. Sorry I couldn't help!
It will turn a dark red brown once it's completely dry, and will stay that color so far as I know if conditions stay consistent. If it changes further it would probably just fade a bit.
I'm fairly sure that the high temperatures used in melting metal would destroy any DNA.
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