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What are the 5 steps in crime scene investigation?
Secure crime scene
Observe crime scene
Document crime scene
Search crime scene
Collection & preservation of evidence
How do you decide what pattern to use?
Based on size/location of crime scene and number of investigators.
What evidence cannot be packaged immediately? Why?
Wet evidence because it could be destroyed by mold or mildew
Taking body measurements as a way to distinguish one individual from another
What two scientists were known for devising experimentation for blood types?
Karl Landsteiner and Leon Lattes
What are the roles of an expert witness?
Establish credibility through credentials, background experience.
Render an opinion about the evidence.
What is the difference between individual characteristics and class characteristics?
Exact identity compared to a common origin
What can fracture patterns tell an investigator?
Sequence of events
Direction of impact
High or low velocity impact
If the refractive index of glass matches that of a liquid, what will you see when ou put the glass sample inside the liquid?
The glass will disappear
What are synthetic fibers and what would be an example?
Manmade or altered fibers
Acetate, rayon, polyester
When performing the sulfur test, what color precipitate should show a positive outcome?
Black or dark grey
What is the difference between hydrophilic and hydrophobic?
How should you collect fiber evidence?
Make tape lifts, bag evidence individually, removed fibers should be folded into a sheet of paper and stored in a paper bag
How long does each stage of growth last?
Anagen- up to 5 years
Catagen- 2-3 weeks
Telogen- 2-6 months
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