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