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Assignment 3.docx - Unit 5 CSI Crime Scene Investigation...

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Unit 5 CSICrime Scene Investigation Assignment 5Marlena PerkinsCrime Scene Investigation, Post UniversityCRJ 342_30, Prof. DyerNovember 27, 2022
Unit 5 CSI1.You are the investigator assigned to collect evidence from a suspected arson.Describe how you would collect evidence containing ignitable fluids.As the investigator assigned to collecting evidence from a suspected arson, the evidencecontaining ignitable fluids requires special care. Searching for the container is important as itmay contain fingerprints or other DNA evidence linking the suspect to the crime. It is suggestedto search for evidence by looking for items out of place, if a container is found, begin the searchfrom there. The search for evidence should be focused on finding the ignition device such as amatchbook or lighter. Liquid residue samples are likely to be found at the point of origin,however, searching in the pour pattern can produce the best evidence samples. The lowest areaswith insulation, porous plastic or manmade fibers, cloth and cardboard, seams, tears and cracks,edges of the burn patterns, and floor drains or base walls are high evidence areas. Tools must becleaned before and after collecting evidence to avoid cross-contamination. Tools with steelblades, such as shovels, hoes, trowels, and chisels, are the recommended tool of choice whencollecting ignitable liquid evidence. Like a paint can, one-quart and one-gallon evidence cansstore residue samples best. As with most evidence, photographing the pour pattern before takinga sample, is necessary. Liquids tend to pool in low areas, so be sure to keep that in mind whensearching for evidence to collect. When collecting the evidence wearing gloves is commonpractice, remove debris, and place the debris samples inside the evidence container leaving one-third of the can empty. The one-third of the space left in the evidence container is called“headspace” and is where the vapors from the collected debris will gather, these vapors are whatthe lab will test. The evidence label needs to be placed on the side of the container, as lids aresometimes removed and replaced (InterFIRE Resource Center, n.d.). Labels should include thelocation where evidence was found, the date and time of evidence collection, and the name or
Unit 5 CSIinitials of the person collecting the samples. Finally, it is recommended to heat seal the bags toavoid holes or gaps in the seal (California Department of Justice, Bureau of Forensic Services,2018).

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Term
Fall
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Tags
Controlled Substances Act

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