CJ 421 Lecture 8: CJ 421 Notes 02-06-2017
29 Mar 2017
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Animal hair and carpet fibers = trace evidence. Small amounts of physical material left behind. Ex: hair, shell casing, fiber from clothing, pollen or soil, blood. You have a trace of the substance (a little bit of it) We look at: chemical make up, manufacture, and location of sale to narrow down where the fiber came from. Trace = a combination/series of monomers, or a unique chain of polymers, that give it a particular chemical structure. Think how our analysis is being used to identify the fiber so it is still preserved. Since it"s real, we have to document it and determine where it came from. Start with photographs to help document it. Ex: cut your sleeve on broken glass - that sleeve now has a very unique cut and a very unique break in that polymer chain (a unique signature) Photograph the scene to see what we"ve recovered, how we"ve recovered it, and where it came from.
