Download - Glass & Soil Review – Part 2
GLASS & SOIL REVIEW – PART 2
______________ solids Refract a beam of light in two different light-ray components (wavelengths)
Results in double refraction
Crystalline
The numerical difference between these the two refractive indices of a crystalline solid is known as ________________.
Birefringence
This is an example of.. . . . . .
Birefringence
Technique used to determine the refractive index of a glass sample is known as the _____________ method.
Immersion
As the velocity of a fast moving projectile decreases, the irregularity of hole and cracks ____________.
increase
Exhibit (a) only shows a __________ fracture
Radial
Glass Collection
True or FalseAll broken glass at a crime scene must be collected, regardless of the size.
FALSE Know ALL of these steps for Glass collection Collect all glass found for piecing Submit all glass evidence found
in the possession of the suspect Collect only a representative
sample of broken glass remaining at the crime scene
True or FalseOnce collected glass should be wrapped up in paper to prevent further damage.
False, Packaged in solid containers to avoid further breakage
Soil CollectionStandard/reference soils should be taken from the crime scene at various intervals within a ______-yard radius of the crime scene.
This will be used as a comparison to questioned soil.
100
Soil is a mixture of _______ and _________ material.
Soil is a mixture of organic and inorganic material.
An example of 100% inorganic soil is _________while an example of a nearly 100% organic soil would is ________.
An example of 100% inorganic soil is sand while an example of a nearly 100% organic soil would is peat.
The inorganic part of soil is ________.
minerals
The organic part of soil is known as _______ which is made up of __________________.
Humas
decayed plant and animal material
The forensic definition of soil includes many things, including:
1. Bits of grass 9. Seeds2. Cinders 10. Animal matter3. Asphalt 11. Spores4. paint5. metals 6. concrete 7. Bricks8. Vegetation
List the five major factors that influence a soil’s composition.
1. Climate2. Parent material3. Living organisms4. Topography5. Time
True or FalseSoil is class evidence - cannot be individualized to a particular location
True
True or False• There is no classification system for soils
True – only guidelines
True or FalseSoils can be easily transported
True – which makes it excellent trace evidence.
True or FalseSoils within a few meters horizontally or vertically differ
True
True or FalseAfter removing the first 2- 3 inches of top soil, a forensic soil analyst can tell if a body has been buried below.
True