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Lecture 3

3FA3 - Week 3.docx

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Andrew Wade

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Week 3 – Crime Scene Investigation – Initial Response – Preliminary documentation and evaluation – Process the scene – Complete and record the CSI Classification of Crime Scenes – Nature of crime homicide, robbery Location – indoor/outdoor Primary/ Secondary Primary – 1 criminal act Secondary: – all others Knowing the type of scene... 1. Predict the involvement of other scenes 2. Nature of other scenes 3. Location of other scenes Starting Points Authorities contacted by: – Construction workers – Hikers, hunters, and kids Organized search First Responders Police, emergency medical, firefighters Only ones to see crime scene in original condition Goal: to NOT destroy evidence 1. ensure safety of the scene 2. assist victim 3. secure and control persons at scene 4. protect and secure crime scene Securing the scene Outside perimeter: – keep out onlookers – caution tape Inner perimeter – borders of crime scene – scene investigation Personnel/ support: – between inner and outer – command post Terminology Search area – all the terrain to be searched Burial site – grave itself, along with localized disturbance Grave – pit used for burial Search Indicators – abnormalities used to detect a burial site Scene Survey and Plan for Evidence Recovery – Devise plan for recovery – Determine personnel needed – Masks, bunny suits, gloves, booties – Prevents contamination – officer and scene Scene Survey and Documentation Examine scene – NO TOUCHING/MOVING Document position of everything – photos (digital and 35mm), video, sketch maps, etc. Organizing and Conducting a Search 1. Preliminary investigation – police 2. Reconnaissance – What type Systematic Planning/ Recovery – Verify/ Exclude testimony – Connect suspect and scene – Reconstruct circumstances – How did remains end up here? – Natural forces disturbing Locating Remains/ Evidence – Remote Sensing – Geophysical Methods – Ground Search Remote Sensing Positives • Colour/ contour contrasts • Cover Large area fast • Does not disturb the area Negatives • Linking objects between screen and ground • Expensive Geophysical Sensing Positives • Quick subsurface survey Negatives • Expensive • Insufficient contrast • Oversensitivity Ground Search Positives • Easy to do • Rapid Coverage • Portable • Accurate Negatives • Inexperienced searchers SearchAugmenters – Scent Dogs body odour crushed vegetation odours decomposition odours Metal Detectors Heavy Equipme
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