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.
Usually in forensic science or any kind of natural science. If you want to go to into drug testing or toxicology, major in chemistry. If you want to do DNA analysis, then biology or biochemistry.
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.
Your nuclear DNA is the same in the skin cells holding your hair in place, your saliva, your blood, your skin, your bone marrow etc. Your friend's DNA is of course different from yours, but the same in their saliva, their blood etc. The criminals probably threw someone else's hair around the crime scene so it wouldn't match them.
It's concerning because juries expect more than is reasonable. Not every case is going to have DNA evidence and you don't always find fingerprints on a surface and eyewitness testimony sounds convincing but can be very unreliable. However an expert can hopefully explain all these issues to make the limitations clear, provided the jury listens.
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Why does this sound like a homework question?
No.
Juries' unrealistic expectations of forensic science may make court cases harder to win, but that's not the same thing.
I'm not a doctor but I don't see why not. If the flesh and muscle is being crushed between the ribs and the person's hands, that would have to cause damage. Sometimes CPR can cause cracked ribs.
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