Murder Mystery

Topics: Blood type, Blood, ABO blood group system Pages: 2 (706 words) Published: November 10, 2008
Murder Mystery - Using Forensics

A decent amount of murderers always leave behind clues for the Forensics team to allow them to figure out who was the culprit in the crime. One really big clue is DNA, fingerprints, and blood at crime scene. In our chemistry mystery, our murderer slips some sodium sulfide into a mixed drink, then finishes the victim with a pistol, but the evidence remains at the crime of the scene and the blood is found splattered all around.

Blood is something that’s found in every living, breathing, reproducing thing in the world . Human red blood cells may contain one or both or neither of 2 antigens, named A or B. Your blood therefore is one of four types: A, B, AB or O, (with the +, and -) which means it contains neither A or B antigen. Blood type AB is the rarest therefore finding that type at a crime scene narrows down the possibilities. The opposite of that is finding type O bloods, for it is the most common and would have a wide variety of suspects. There is also a thing that is called genetic markers. Genetic markers function the same for every human being. There are so many genetic markers that finding 3 or 4 same markers in a human being is enough to pick him out of 1 million people. So if they have the same blood type and 3 or 4 genetic markers, it is pretty clear to have them as a top prospect. But once the blood is outside the body, the enzymes deteriorate. By the time that a bloodstain dries, some of the genetic markers are already gone. Since everyone blood type is kept on record, they can just look you up on a computer to see if you are a suspect or not.

Another tactic to catch the criminal and plays a big part is called blood splattering. By observing the size, shape, distribution, location, angle of impact, and the surface it was found on, can tell you a whole a lot about the crime. This also means that if a blood splatter was found on someone it means that they were at the scene when the crime happened. Blood...
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