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ANT205 - Sept 26 (Crime Scene Investigation).docx

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Carolan Wood

Crime Scene Investigation - Crime scene investigation in Canada o Carried out by police officers o Response to scene o Scene security o Crime scene survey /document what they see o Documentation o Recognition of physical evidence o Examination and collection of physical evidence o Packaging and preservation o Examination of physical evidence o Crime scene analysis o Crime scene reconstruction - Classification of crime scene o Nature of crime  Homicide, robbery, etc; o Location  Indoor, outdoor, etc; o Primary/secondary  Primary  First criminal act took place  Secondary  Any other crime scenes - Knowing the type of scene o Predict involvement of other scenes  Dumpsite would USUALLY mean there’s a preliminary scene o Nature of other scenes o Location of other scenes - First responder o Police, emergency medical, firefighters (mostly firefighters get there first) o View crime scene in original condition o Do NOT destroy evidence o 1 priority – assist victim nd o 2 priority – search, apprehend suspect o Secure and protect crime scene - Secure the scene o Outside perimeter  Keep out onlookers  Caution tape o Security officer  No nonessential people  Sign in and out  Time and purpose o Inner perimeter  Borders of crime scene  Scene investigators permitted only o Personnel/support  Between inner and outer  Command post - Outer and inner perimeters of Ruskin Scene – Pickton Investigation - Physical evidence o Useful information o Clues o Crime taken place o Info about MO (motive operation) o Links/connects people, places, things o Witness statement o Identify suspect o Provide lead o Patterns and positions - Conditional/transitory evidence o Conditional: produced by event or action o Transitory: not permanent/temporary, easily lost or changed o Not observed and documented immediately will be lost forever  Position of doors, windows, furniture  Lights on or off  Colour of flames  Presence of odours (gas, perfume, smoke)  Position of folds of clothing  Placement of bed sheets  Towels, cloths, etc; dry or wet?  Blood wet, coagulating or dry?  Temperature (affects rate of decomposition) - Transfer/trace evidence o Physical contact between people/things o Locard’s theory of exchange o Mutual exchange of trace matter between any two surfaces that come into contact with one another  Fibres, hair, etc; - Scene survey and documentation o Examine scene – NO TOUCHING/MOVING o Document position of everything  Photos (digital and 35mm), video, sketch maps, notes o Videos  No sound or no talking  Move slowly  All perspectives  Show processes  Date and time  Entire scene close-up - Scene survey and plan for evidence recovery o Devise plan for evidence recovery o Canada – IDENT officers process the scene o Masks, bunny suits (Tyvek), gloves, booties  No heels, earrings, no fancy attire o Prevents contamination – officer and scene - Evidence collection o Recognition – different if inside vs. outside o Marks of forced entry o Scratches at keyhole o
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