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Blood Spatter Essay

968 words - 4 pages

Ever since the Showtime series Dexter aired in 2006, blood spatter has become a well-known technique used in criminal cases. This method of investigation has been studied since the late 1890’s, but the first case that blood spatter analysis was used in wasn’t until 1955 (Freeman). Though blood spatter is an older method of solving crimes, it still plays an important role in finding a perpetrator.
For instance, one way that blood spatter aids in criminal investigations is that the forensic technicians can figure out what kind of weapon was used. When looking at a drop of blood, the forensic scientists can measure the diameter of the spatter. If the width is 4-6 millimeters, then it is ...view middle of the document...

First off, there is transfer spatter. That is whenever someone comes into contact with the blood, and then they carry it somewhere else (Johnson). Depending on what kind of transfer there is, it can reveal the size or make of their shoes or the size of the perpetrators hands. Knowing this information can narrow down the suspect pool significantly. The second kind of spatter is cast off. This happens when someone is stabbed, and the bloody knife is swung in the air (Johnson). It creates a trail of DNA on the ceiling and surrounding walls. If the body is removed from the scene, this can tell the technicians approximately how many times the victim was stabbed (Johnson). This number is a parallel to the strength of the person they’re looking for, which in turn reveals the gender of the suspect. Back spatter is the third kind of spatter that the scientists look for (Johnson). This occurs when the blood is sent backwards due to force. This often happens when someone is shot; their blood is projected to the wall behind them. This kind of spatter can give the most definite information as to the physical characteristics of the perpetrator. Using the back spatter, forensic scientists can find the angle of trajectory. Because of the way the blood is spaced out and where it is on the wall, the analyst can find the height of the suspect give or take a few inches (Johnson). Historically, blood spatter analysts would connect strings to the marks on the wall and either a blood pool or a bullet hole in order to find the point of trajectory. In modern times, there are laser programs that can do the same thing automatically. This method more accurate and easier to operate.
After hypothesizing about the appearance of the suspect, the blood spatter...

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