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Basics Of Bloodstain Pattern Analysis I

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On 01/18/2018 at 0745, I (Officer Molly Harvey) attended a lab entitled “Bloodstain Pattern Analysis I”. This lab session was held at the Des Moines Area Community College (D.M.A.C.C.), Ankeny campus, in Building 3W, classroom 02. The presentation was conducted by DMACC criminal justice professor Steve Martin. The first part of our lab started with a presentation, it consisted of 24 pages, each page covered a basic knowledge of blood evidence analysis. The presentation was labeled, “Basics of Blood Evidence Analysis”, a copy will be available in my casefile. In an order of what was presented, I first learned the different significances of blood evidence. Spatter patterns help recreate what happened at the scene, and D.N.A. also helps to identify and exclude suspects. The white blood cells contain the D.N.A. used to identify those suspects. Also it was explained that blood when oxygenated is bright red, and when unoxygenated is dark and almost purple. Professor Martin presented that blood evidence can help sequence what has happened at a crime scene, whether the bloody fingerprint came first or the spatter did. Also included throughout the presentation was a variety of types of blood patterns. Projection mechanisms include cast-off, arterial, and expirated (blood in an airway that could be spit or coughed up); I learned that …show more content…

Throughout the class, students had set modules that their learning schedule was based on. Most of these modules were covered in the powerpoint presentation Professor Martin made available to my class. The students learned about blood patterns by setting up real life crime scenes in abandoned homes, and also experimenting with gunshots wounds and identifying the spatter

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