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. Depending on where you work and what you do, your employer might want you to be 'certified' in one area or the other.
No. You might be able to estimate muzzle to target distance from a spray pattern, but not firearm type or brand.
Because not everyone's fingerprints are in a database. You only have fingerprints taken when you are arrested or apply for a job or some other license for which it is required. Not all of those necessarily end up in a database accessible to the agency that has the unidentified person. And DNA such as hair only helps when you have a profile to compare it to--if the unidentified person is a convicted felon so their DNA might have been entered when they went to prison, or if there are family members available to give a sample (in which case you would have to already have an idea of who the person might be). It's not really like TV. We don't have databases of every single person and every single substance known to man.
"Unreliability of a science" is pretty a broad swipe, so I don't have any idea what you're referring to. Any line of work--government, plumbing, brain surgery--can be unreliable if the people doing the work are undertrained,overeager, arrogant or lazy.
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I was going to email your teacher but you didn't give me her complete address, just her name. Please go to my website and hit 'contact me' and let me know where to send a response. Thanks and good luck with your project.
I'm sure document examiners could do this fairly easily but I don't know exactly how. I would guess that alternative light source (like infrared or ultraviolet spectrums) could show that there is no difference between the signature and the rest of the document. Or I believe thin-layer chromatography could show that the chemical makeup is the same. A Questioned Document Examiner could tell you much more.
I checked city and county websites for job postings.
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