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Evidence & Crime Scenes - Part 3

This lecture covers initial crime scene processing.

Rachel Stagner

on 28 July 2018

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Transcript of Evidence & Crime Scenes - Part 3

Crime Scenes,
Part 1

Crime Scene - any place where evidence may be located and gathered to help explain events.

When processing a crime scene, authorities must gather evidence that proves:
That a crime occurred
That the person(s) charged with the crime was responsible for the crime
Additionally, the sequence of events, the modus operandi, or MO, and the motive should be taken into account

Sources of evidence
Primary and/or secondary crime scene
First police officer on the scene
Medics (if necessary)
Medical examiner (if necessary)
Photographer and/or field evidence technician
Lab experts
Crime Scene Team
Processing a Crime Scene
Preserve and isolate the scene
Observe and document the scene
Search for evidence
Collect and package evidence, maintaining the chain of custody
Submit evidence to the crime lab for analysis
A - Assess the crime scene and assist the injured
D - Detain the witness
A - Arrest the perpetrator
P - Protect the crime scene
T - Take notes
First Officer
on the Scene
Walk-through : performed by the crime scene investigator, the first officer, and sometimes the lead detective
Mentally prepare a reconstruction theory
Note any transient or conditional evidence that could change over time
Note environmental and weather conditions
Note points of entry or exit, as well as paths of travel within the crime scene
Record initial observations of who, what, where, when, and how
Identify special needs within the crime scene for personnel, precautions, or equipment and notify superior officers or other agencies
Crime Scene Survey
Notes: date, time, description of the location, weather and environmental conditions, description of the crime, location of the evidence relative to other key points, the names of all people involved, modifications that have occurred, and other relevant information
Photography: photos of scene and surroundings; mid-range to close-up photos with various angles of each piece of evidence; photos as viewed by any witnesses
Sketches: inclusion of date; time; scale; reference points; distance measurements; names of investigators, victims, suspects; a legend (key)
Videography: allows for narration (non-subjective) and different perspectives
Line or strip method—best in large, outdoor scenes
Grid method—basically a double-line search; effective, but time-consuming
Zone method—most effective in houses or buildings; teams are assigned small zones for searching
Wheel or ray method—best on small, circular crime scenes
Spiral method—may move inward or outward; best used where there are no physical barriers
Photograph outside with distance and close up views of all access points

Room shots show 4 corner views

Distance and close up photos of evidence
Full transcript