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ANT 205 - September 23rd, 2013.doc

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University of Toronto Mississauga
Carolan Wood

Topic // Crime Scene Investigation • Crime Scene Investigation in Canada is completely done by police officers ONLY - they are the first to respond to a scene - they are responsible for the security of the scene ( no one gets in or out) - they are required to complete a Crime Scene Survey (document what they see) - EVERYTHING is documented - It is also their responsibility to recognize ALL FORMS of evidence - The police COLLECT ALL physical evidence - They must properly pack and reserve evidence - Police officers examine physical evidence and then perform a crime scene analysis and move on to reconstruct the crime scene Classification of a Crime Scene // Crime scenes can be classified differently according to the: • Nature of the Crime - homicide, robbery • Location - indoor or outdoor *Crime scenes are classified as Primary Scenees or Secondary Scenes Primary Scene – where the FIRST and INITIAL criminal act occurred Secondary Scene – where every crime after the first criminal act occurred Knowing the type of Scene involves: • predicting the involvement from the primary and secondary scene • knowing the nature of the scene • knowing and understanding the location of other scenes First Responders – the first people on the scene of a crime • Police, emergency medical or firefighters • First Responders are the ONLY ones to view thecrime scene in its ORIGINAL condition • First Responders have different responsibilities than Crime Scene Investigators. They don’t want to DESTROY evidence but they have to save lives. Their first priority is to ASSIST the victim. nd rd Their 2 priority is to search and apprehend a suspect. 3 is to secure and protect the crime scene. Yellow Tape refers to the outside perimeter of a crime scene, which is portioned off with CAUTION TAPE, which keeps out lookers OUT! A security officer is always present to keep non-essential people out, requiring anyone to sign in and out with a time and purpose of their visit . Orange Tape refers to the inner perimeter where the crime scene investigators actually work. This borders off the crime scene. Support Personnel (Command Post) are between the Yellow and Orange tape. Physical Evidence • Anything that can provide USEFUL information • These often provides clues to a case and provides insight on whether or not a crime has taken place or not • Physical evidence provides MO, motive of operation, how a crime was committed. • Phusical evidence links people to place and or things • It provides a witness statement and requires it • Anything that can potentially provide a lead to a case and physical evidence can show us patterns & positions of objects,body etc to a murder weapon. This is known as context. - strand of hair Conditional/Transitory Evidence Conditional – dependent upon something else. Produced by an event or an action Transitory – not permanent and purely temporary, easily lost or changed. If something is not obvserved or documented right away – information will be lost forever! Transfer/Trace Evidence • based on the principle of Locard’s theory of exchange • every contact WILL leave a trace • this is the MUTUAL exchange of trace matter between any 2 surfaes that come into contact with another. I,e – fibres, hair Scene Survey & Documentation • an examination of the scene will be done where NOTHING will be touched and altered. • Everything will be documented via images and video. Video must have NO SOUND, slow movement only, all perspectives must be shown, the entire scene to close ups must be seen. Scene Survey & Plan for Evidence Recovery *after collecting evidence a plan must be devised for evidence recovery • transitory or conditional evidence will be reported first • In Canada – IDENT officers process the scene. Masks, bunny suits (Tyvek), gloves and or booties. This is done to prevent the contamination of a scene. Evidence Collection • Evidence collection for inside versus outdoor scenes are different • Types of Evidence Collection for indoor crime scene: Marks of forced entry, scratches at keyholes, lights working or unscrewed , contents of an ashtray (good for DNA), toilet seat that is up or down or if anything is in the toilet tank, look for stains, splatters on the walls, sheets or surfaces. IDENT OFFICERS • they are one tthat conduct presumptive tests • it is their job to preserve and package evidence • they must label items CORRECTLY and not unambiguously labeled • Hemastick: stain on a stick which tests positive or negative for blood Alternative Light Source - using lights to reveal stains, fibres, impressions or fingerprints - EVERYTHING is documented with photos and video What do Scene Photos do? • brings an audience/jury progressively closer to EVIDENCE • images help provide the context of the scene • Take a wide image of the scene, a medium wide image of the scene and then close ups • Take images with and without an arrow, scale, and label. This is done to show t
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