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Crime Scene Analysis

Crime Scene Analysis. Chapter 2. Physical evidence. Any and all objects that can establish that a crime has been committed or can link a crime and its victim or perpetrator Physical evidence that is collected can be analyzed by one of the divisions of the crime lab

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Crime Scene Analysis

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  1. Crime Scene Analysis Chapter 2

  2. Physical evidence • Any and all objects that can establish that a crime has been committed or can link a crime and its victim or perpetrator • Physical evidence that is collected can be analyzed by one of the divisions of the crime lab • http://www.youtube.com/watch?v=awcnMrZiSmU

  3. Securing the crime scene • Crime scene must be secured and recorded • Any medical assistance is given first • Tape is used to block access to crime scene area • Boundaries are determined • Entrance and exit sites are determined • http://www.youtube.com/watch?v=YnQ945PtfiY

  4. Recording the crime scene • Police must record crime scene in untouched state (before any contamination to crime scene) • Three methods: photography, sketches and notes • http://www.youtube.com/watch?v=KHUmfTM7UoQ

  5. Photography • Scene must be photographed without being moved or altered in any way (unless someone needed medical attention) • Crime scene and all adjacent areas • Physical evidence in crime scene and close ups are taken • Digital photos and videotaping can be used • http://www.youtube.com/watch?v=Ei_ROza-l_g

  6. Crime scene sketches • Sketch the scene • Rough sketch with accurate dimensions and location of evidence • Finished sketch—more detailed fine sketch to be used as evidence • http://www.youtube.com/watch?v=qtLeko20xec

  7. Crime scene notes • Detailed description of scene and location of physical evidence, and who found, and how packaged and marked • Notes can be written or tape-recorded • http://www.youtube.com/watch?v=3kSpY9CA4Cw

  8. Dealing with physical evidence—Systematic search for evidence • One person in control of collection to avoid duplicate analysis • Weopons • Contact between victim and suspect evidence • Cross transfer of evidence • Hairs • Fibers • Blood • Point of entry marks • Trace evidence—imprints in ground • Inside and outside of crime scene should be analyzed • http://www.youtube.com/watch?v=RC4z4t5fGgY&feature=fvsr

  9. Collecting physical evidence • Trace evidence and things like clothing that might contain trace evidence are packaged and sent to lab • Fingernail scrapings of individuals are collected • Autopsy is conducted • Items from deceased victim are sent to crime lab: • Victim’s clothing • Fingernail scrapings • Head and pubic hairs • Blood • Vaginal, anal, and oral swabs • Recovered bullets • Hand swabs Each piece of evidence is packaged separately

  10. Chain of custody • Evidence must be submitted with documentation and labelled to type • Every person who handled evidence between collection at crime scene and presentation at court must be documented • http://www.youtube.com/watch?v=rc-hhmi1-NA

  11. Forensic Pathologist • Who? • What type of injuries? • What caused death? • When did injuries occur? • Time of death?—condition, rigor mortis , livor mortis, algor mortis, potassium levels in ocular fluid • http://www.youtube.com/watch?v=XYEQmgT4nxE&feature=related • Rigor mortis—stiffening of muscles between 24 and 36 hours after death • Livor mortis—settling of blood in areas closest to the ground • Algor mortis—body temp cools after death until it is room temp

  12. Forensic anthropology • Identification and examination of human skeletal remains • Bones reveal age, gender, race, and skeletal injury • May create facial reconstructions • http://www.youtube.com/watch?v=ZsHgv2UnFdc&feature=related

  13. Forensic Entomology • Used to estimate time of death or timeline of crime • Bow flies lay eggs of human remains that hatch and consume human organs and tissues • By examining stage of insect development—timeline can be estaablished • http://www.youtube.com/watch?v=6U4ewxenyYU

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