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.
I very much doubt anything self-ignites, but I'm not an expert on explosives. But where oil is concerned I'm fairly sure you would need a spark to ignite it.
Okay, I emailed you.
As far as I know--and I am not a DNA expert--multiplying the frequencies of each allele tested is what gives us the astronomically high numbers of elimination of people having that same set of alleles. A SET of data points eliminates many more people than a single data point, in other words.
I am so sorry I didn't get back to you earlier! I can be reached through my website at www.lisa-black.com.
Though if you look through previous questions and answers, you might find that someone has already asked what you would like to know.
Mailman (City Letter Carrier)
Is there a big difference in the amount of mail you deliver today from 5-10 years ago?
Hospice Nurse
Ever heard any crazy deathbed confessions or family secrets revealed?
Subway Store Manager
Does Subway have a secret menu?
In general and barring other explanations, if the area around a hole caused by a bullet is gray that is caused by fouling, or vaporized lead from the bullet exiting the gun within approximately 6 inches of the hole. That would indicate that the hole is an entrance. Is the gray on the inside or the outside of the hat? I can't explain why there would not be blood on the hat (again, are we talking the inside or the outside?) unless it was literally blown off the head before the blood began to spill, but that is unlikely in the case of an exit I would think.
You can't go wrong with science classes. When I was in college they didn't have courses specifically in forensic science, so that wasn't an option. Look especially for classes where you can do hands-on work in the lab or field. And different agencies will have different requirements, so you might want to go online and check out the different vacancies to get some idea of what requirements are out there.
I'm afraid you'd have to ask a doctor. I'm not an expert in that area, but I could make a guess that it depends a great deal on what he lands on when he falls. Also, has anything in the loft changed recently? Maybe he rearranged the furniture so his bed is closer to the edge?
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