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.
If the stain is still visible, then clearly the semen is still there, so I see no reason why it wouldn't still have DNA in it. There might be a mixture from swabbing up the skin cells as well as the stain.
Hope that helps!
You will most likely need at least an associates degree in forensics or a natural science. How agile you need to be depends on what you're doing--if you're working in a lab, consistently on level ground, a disability would not be an issue. If you're doing crime scene work and you need to sometimes climb on top of roofs or into attics, out in fields, etc., then you need to be mobile. But nothing like police officers or rescue personnel.
Hope that helps!
I can’t speak to this guy’s course specifically, but deception detection training is often offered to detectives and law enforcement personnel. I sat in on a two day course through my department once, just to use in my writing.
That entirely depends on the requirements of the hiring agency. Since they’d probably require advanced schooling so hirees would wind up being older. It also might have to do with liability if the person would need to drive agency vehicles, etc.
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I have no idea.
I know they utilize most a GC and Mass Spec, a Gas Chromatograph and a Mass Spectrometer, but I've never used either one.
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