Biological Evidence

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Biological Evidence Pedro Brache CJS/215 12/22/2014 Jerry Shoate

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Biological Evidence Biological evidence is evidence that can be tested through DNA mapping and other profiling methods. Each specific type of evidence, whether it be saliva sample or semen sample, needs special techniques in acquiring and preserving in order to avoid cross contamination. These types of evidences are cross examined with a suspected person to either exclude them or prosecute them for the crime. In this paper I will discuss the different types of evidence and how it is preserved when it is obtained from a crime scene. Different Types of Evidence A forensic team might encounter different types of evidence at a crime scene. It is on the team to handle and ensure the proper transportation of that evidence to the laboratory. There are different teams assigned to a specific type of evidence. Some are in charge of ballistics for example, while others handle blood stains. Different crimes may present different types of evidence to look for. In a sexual assault case, investigators may be looking for bodily fluids or hair samples. Blood is a very good source of evidence. The DNA can be extracted from the blood and help narrow down suspects. The way the blood spatters are found in the crime scene can help investigators piece together the events of the crime. This is why it is important to correctly document and handle it while avoiding cross contamination. Forensic scientists are faced with either dried blood or wet blood. Different methods of extracting the blood sample sometimes depends

!3 on the location of it. Each hold their advantages and disadvantages in their approaches to retrieve the best quality of samples.

Biological Evidence Pertaining to dried blood stains, different methods are required to retrieve a good sample. One method is “tape lifting” bloodstains by…...

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