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two things to remember when completeing an investigation
- establish crime scene debreifing team
- perform final survey of crime scene
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Minimum # of photos at crime scene?
10
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How does glass fracture?
Conchoidally, it breaks easily and ejects small fragments
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What do the Conchoidla lines tell us about glass breaking?
The direction of which it was struck (inside or outside) it is the direction of force.
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What are the two fractures of glass
- Radial- the cracks that radiate out from the source
- Concentric-the impact circle and cracks around it
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You look at glass microscopically for 3 properties, what are they
Physical, Optical, Elemental
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How do you differentiate glass, what method
Becke line method, with the refractive index
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Name the 4 characteristics of hair
Medulla, Cuticular, Cortex, Pigments
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Caucasion hair is typically
BLD, BRN, BLK, fine to medium coarseness, straight or wavy
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African hair is:
Curly or kinky, mostly BLK or BRN, pigments are large and in clumps
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Asian hair is:
THICK, BLK/BRN, Straight, wide medulla
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Fringe Hairs are:
Not suitable for comparison and are leg/arm hairs
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Properties of fibers
color, fiber twist, thread count, direction, cloth, dye
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5 types of fibers
- Animal (wool)
- Vegetable (cotton)
- Synthetic (polyester)
- Mineral (glass wool-insulation)
- Blends of both synthetic and natural fibers
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