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Lecture

Crime Scene investigation .docx

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Department
Anthropology
Course
ANT205H5
Professor
Carolan Wood
Semester
Fall

Description
Crime Scene investigation  Completely done by police officers (RCMP, OPP) They response to the scene, and secure  Then they survey (documentation) They must recognize physical evidence Collect, package/preserve, and examine physical evidence They do a crime scene analysis  crime scene reconstruction  Classifications fo Crime Scene Nature (homicide, robbery) Location (indoor/outdoor) Primary, Secondary scene (every scene after) Knowing the type of scene Predict involvement of other scenes Nature of other scenes Location of other scenes  First Responder police, emergency, fire fighters Only  ones who view crime scene in original condition First priority­ assist victim Second victim­ apprehend suspect Third Priority­secure and protect crime scene  Securing the Scene Caution Tape­ outside perimeter to keep onlookers Security officer keeping non essential people out sign in and out, time and purpose Inner perimeter­ borders of scene, only investigators  There is personnel support between inner & outer perimeters  Physical Evidence All useful info talks about crime take place info about MO (modus operandi)  id suspect  witness statement anything that will provide lead patterns and positions that may link with other cases  Conditional and transitory evidence Conditional­ produced by event or action Transitory­ no permanent They are not mutually exclusive If not observed and documented immediately, it can be lost forever  Transfer/ Trace Evidence Physical contact between people and things  Locard's theory of exchange      Take something, Leave something  Mutual exchange of trace matter btw any 2 surfaces that came into contact with one  another Scene Survey and Ecxhnage Examine scene­ no touchy Document position of everything      Photos, videos, sketch maps, notes Videos      No sound, move slowly, show all perspectives, date and time, entrée scene  Scene survey & Plan for Evidence recovery Devise Plan for evidence recovery Canada­ IDENT officers process scene Masks, bunny suit Evidence & Recollection Recogntion­ different if inside v. outdoors Marks of forced entry Scratches at key holes Contents of stray Toilet seats up or down Look for stains, splatters, floors, sheets, ceilings  IDENT They do presumptive tests  Hemastick (rubs stain)      stain is likely blood      Further tests determine type of blood  Alternative light source      Stains, fibres      Impressions, fingerprints Document      Photos, video ect. Scene Photos Bring audience closer to evidence Overall      Context of scene      Street sign or  landmark if possible Mid­range      Object in the scene  Photos Taken with and without N arrow  Scale Label Why? Evidence Collection IDENT offcier Preserve Unambiguously label Package Exhibits/Evidence officer      Keep track of exhibits      Chain of custody Chain of custody formal tracking of exhibit Who had it, when and why To be admissible in court      chain of customy must belcear      No possibility of tampering or contamination Colllection No set order      Most fragile
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