Fiber
Do fibers provide more evidential value than hair?
Yes
What type of evidence?
Class
What are the type of glass?
Tempered, laminated
What is Locard's Theory?
fibers can be transferred to/from a person or objects linking them to one another
Anything in the vegetable class (pollen is the most helpful form of botanical in criminal cases)
How is glass involved in a crime scene
Small fragments can be used as trace evidence (link objects/people); Reconstructing the crime scene from analyzing the breaks in glass.
What percent of fiber falls off evidence after time?
80%
Soil is classified by?
Texture; Structure; Consistence; Permeability
How do you determine the direction of the projectile?
When looking at a radial section, conchoidal fractures point back to the origin of the break; Core usually on opposite side of the origin
What are the 3 fibers?
Natural, synthetic, manufactured
What is Permeability?
Permeability is the ability for water to percolate downward through the soil
Describe heckle marks
Large fragments of glass that originated from the point of impact do show characteristic conchoidal (or 'heckle') marks along the edges. These marks can be used to determine the side on which the impact occurred and so help to reconstruct the window.
What are the characteristics of fibers?
Color, size, shape (refractive index)
Analysis of soil are?
Gross visual appearance (stereomicroscope); Comparing color and texture; Examining materials in soil; Determining identity of rock and mineral fragments
Describe how to find refractive index and what it is
Low relief = no outside edges are visible; High relief = thick outside edges are visible; Determined by placing glass in oils of different refractive indexes