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.
As far as I know since they would all be the same type of cells, they could not be separated.
I would suggest biology or chemistry, but that was what everyone took when I started out, so I may be behind the times. Your best bet is to call the crime labs you might wish to work at and ask what they prefer. Also check employment postings on the forensic organizations websites, such as IAI and AAFS. That's the only way to be more certain what they actually want.
Only local, to other government agencies or for training.
Wouldn't that get the whole crime scene wet? And wouldn't a layer of hair indicate that the hair was a diversion, since obviously no one would normally shed that much hair while committing a crime. It scattering hair wouldn't affect fingerprints or touch DNA, which crime scene techs would be looking for more than hair anyway. Most labs don't even analyze hair any more. Also, I should clarify, hair cells don't have nuclear DNA. DNA in hair usually comes from the skin cells that hold the hair in your scalp and cling to the root. So if you're using cut hair there would not be any nuclear DNA to obtain. Mitochondrial DNA is a different type of DNA present in your cells' mitochondria. It will be the same throughout your body but is passed down unchanged from mother to child so it will be identical with your mother, your mother's siblings (assuming the same grandmother), your siblings from the same mother, your first cousins from your maternal aunts, etc. But very very few labs test mitochondrial DNA so it's unlikely it would be tested from your crime scene unless it was extremely high-profile and they had no other evidence to use. And then they'd have to have a suspect to compare it to or it would be useless. (CODIS, the national DNA database, is nuclear DNA.)
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A forensic scientist, forensic specialist, forensic technician can all be the same job or different jobs--your title is whatever your agency/boss says it is. There's no strict uniform code for titles. Usually any natural science is a good background for forensics. It may depend on whether you intend to work in a lab or on crime scenes. The best way is to look at job postings that interest you and see what the requirements are. You can view job postings on professional organizations' websites such as www.aafs.org or www.theiai.org. Good luck.
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