1.24.14 Crime Scenes.docx

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Environmental Toxicology
ETX 20
Kanthaswamy, Sreetharan

Crime Scenes January 24, 2014 Why do we go to crime scenes? Reconstruction Discover key evidence (for crime lab) What is at a crime scence? -evidece of events -evidence from the suspect Conclusive (thumbprints etc), circumstantial (little pieces together), interpretive (varies by analyst) What are the steps? Arrival issues Stabilization issues Scene security Set boundaries General survey (walk through) Overview photos and sketching (documentation) Collection and preservation What are the elements of the arrival? Safety of responding personnel Check the medical condition oof the victim Prevent loss of evidence due to medical aid, suspect action, and environmental issues (wind, rain, snow heat) Stabilization of the scene? Insure suspect is or isnot present Remove all personas from the scence Protect perishable evidence like sho/tire imprints, fingerprints, GSR (gun shot residue Isolate the participants Effects of weather (rain etc) How to crime scene security? Use tape or guards Purpose is to restrict access to select few Log who enters and leaves the scene How to set boundaries? Better to overestimate (but w/in reason) Consider entry and exit (routes) Focus on 3 dimensions (major scenes can have airspace closed) How to assess the crime scene? -who needs to be notified: supervision, coroner, crime lab, sheriff, specialized assistance Determine what is critical for immediate processing/set priorities What goes on in processing the scene? 90% of time in documentation Photos, video, fingerprints, note taking, bagging and tagging evidence collector, security, sketches General survey: Limited it one or 2 ppl Note likely entry and exit points Note misplaces, foreign objects Not locations of prints trace Prevent contamination Organize. How organize? Designate trash areas, commence center, smoking areas, equipment areas Where is the command center (admin of crime scene, sometimes held at neighbors house), restrooms, food/drink, phones (or anything that can be listened to) If night is approaching, how much will be done, Order of processing Scene documentation? Photography, sketches, and note taking. How to Search and locate evidence? Flag entry areas Be systematic Mark, record, collect Packaging and labeling Order of collection (trace evidence, then biological evidence, then fingerprints, then references) Preservation R
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