crime scene
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what does the the collection stage include
the identification of what is evidence or what could be evidence
how is evidence documented
including notes, photographs, and increasingly 3D scanning
what is trace evidence often associated with
Locard’s exchange principles
chain custody/evidence
a written documentation of every location/ individual that the evidence has been in possession of
search warrant
obtained to search places and things where a suspect has a reasonable expectation of privacy
broken chain of evidence
the chain so broken or undocumented that the court could not allow the evidence to be admitted because there is no reliability that the evidence offered is the same as taken from the crime scene
Steps of on-site crime scene investigation
• Ensure that the victim is not present or in need of help ii. Ensure that the scene is safe and not suspects are present iii. Block off the scene iv. Detain all witnesses. Establish a security log to document all people who come in and out v. Observe and take notes vi. Determine if the scene is the primary or a secondary crime scene vii. Photograph the scene; videotape the scene viii. Draw a sketch of the scene and add notes ix. Collect evidence, bag it and seal it for transport to the lab