LIsa Black
Cape Coral, FL
Female, 49
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 don't understand what you mean by 'purification of blood.'
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Who knows? It all depends on where the samples were and how thoroughly the surface was cleaned. If blood was on a glass window and it was thoroughly cleaned, then all of it is probably gone for good. If it's a porous bare wood, then probably not...unless it was thoroughly soaked with a bleach solution. If it's a large area, even if it's cleaned there might still be some left in the nooks and crannies--like in a tile floor, the ceramic may be clean but the more porous grout between the tiles might hold a substance. So there is no way to say it's always possible or it's always not possible. PS Luminol helps you find blood. Christmas Tree stain is used to stain a dried semen sample on a glass slide. It doesn't help you find the semen in the first place.
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Possibly, depending on the time elapsed.
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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.
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Mailman (City Letter Carrier)
Is there a big difference in the amount of mail you deliver today from 5-10 years ago?
Waitress
What types of customers are the worst tippers?
Auto Mechanic
If I know nothing about cars, how can I tell if a mechanic is ripping me off?
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.
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I don't know what you mean by 'abusement'. Like child abuse, or sexual abuse? Basically you look for whatever confirms or refutes the victims' story or your theory of the crime. First was the suspect at the right location at the right time for this crime to have occurred--you look at receipts, witness statements, GPS, anything that puts the relevant people in the right places. Then is there physical evidence of the alleged action occurring--bruises, blood, semen, a weapon found at the location. Then is that evidence tied to the suspect by DNA or other means?
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Having to testify in court, which is the most awful kind of public speaking ever because there are people there trying to make you look incompetent. You deal with it by practicing and preparing and training yourself not to take it personally. The other challenge is learning to communicate, in different ways with different groups. With victims and family/friends of victims, you have to be empathetic without talking to them about the investigation, because that's the detective's job. With co-workers, detectives and cops, you have to give them all the information they need or want without bruising their egos. This takes practice and focus.
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