soils, minerals, wood, & other vegetative matter
DESCRIPTION
Soils, Minerals, Wood, & Other Vegetative Matter. bsapp.com. Soils, Minerals, Wood, and Other Vegetative Matter. Location Link suspect Trace Evidence. bsapp.com. Soil. Any material, both natural and artificial, that lies on or near the Earth's surface - PowerPoint PPT PresentationTRANSCRIPT
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Soils, Minerals, Wood, & Other Vegetative Matter
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Soils, Minerals, Wood, and Other Vegetative Matter.
Location Link suspectTrace
Evidence
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SoilAny material, both natural
and artificial, that lies on or near the Earth's surface
Most of this evidence is only useful as support or lead generating
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Examination of SoilThroughout the examination of soil an observer must:
Look for trace evidenceCompare the physical and chemical properties of each sample to a control sample
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Matching Soil Samples
Two samples are considered to be the
same if and only if they match on each and every level of the
following tests
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Dry Samples & Pulverize
Dirt changes shade and color at different moisture levels
Dried dirt may clot
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Gross Examination
ColorTextureShapesForeign Objects
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UV-Observations Note the shape, size, number, and
identity (if possible) of any material that fluoresces
Compare Samples
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The clothes of this female look
normal.
Any chemicals?
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A UV-Light may also be used to find trace evidence on a body
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Microscopic Observation
ColorTextureShapesForeign Objects
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Place a thin layer of dirt on a slide
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Place only a small amount of sample on the slide at a
time. Be sure the dirt is placed only in the center of the slide so as not to
allow it to fall in the microscope.
WARNING
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Place a second slide on top of the sample
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Naked Eye
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Microscopic x10
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Microscopic x40 (Cotton Fiber)
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Final Comparison Any and all foreign objects found
should be investigated separately If all previous comparisons are
similar between two samples they likely originate from the same area
As final comparison density gradient columns may be utilized
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Naked Eye
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Microscopic x40 (Minerals)
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Naked Eye
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Microscopic x40(Organic Material)
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Density Gradient Tubes
Assemble two identical density columns with varying levels of liquids in them
Drop equal amounts of soil samples (a control and unknown) in the columns
Allow the samples to disperse throughout the columns for comparison
If the two samples are of the same origin, then they will produce nearly identical gradient tubes
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