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Soil samples are _____.
Distinctive by location
_____, Dr. Hans Gross was one of the first investigators to believe in the value of trace evidence, including soils, found at crime scenes.
In the late 1800s
Organic material in soils are _____.
Carbon-based materials
_____ sand is found near the rocks from which it was formed.\
Immature
When collecting soil evidence, _____ material must be collected.
At least four tablespoons of
_____ are microscopic evidence with pink, perforated shells that can be found in soil.
Forams
An experimental two-method system, HPLC coupled with GC analysis, _____.
Provides nearly 100 percent accuracy in comparing soil samples
New technology, called LABRADOR, _____ when scents are detected.
Emits light and sound
Chemical testing is done on soil samples to _____.
Determine water content
Topsoil and humus located deeper in the ground than normal _____.
Could be an indication of a gravesite
Biogenic sand _____.
Occurs only in tropical regions
Sand containing small, round structures made of calcium carbonate is called _____.
Oolitic sand
If more than one mineral is found in the sand grain, it is _____.
Called a fragment
Loam is _____.
Composed of sand, silt, and clay
Humus in soil _____.
Affects the texture
An acidic soil will have _____.
A pH lower than 7
Forensic soil analysis is used to _____.
Help law-enforcement by using chemical scents in the soil to locate bodies
Clay in soil is _____.
Weathered olivine
While harvesting peat for soil amendments, a body is found. Police believe the female body may have been a victim of crime. Crime scene investigators are called to collect evidence. Investigators note that the body does not have typical signs of decomposition. Although discolored, the body is intact and well-preserved. After examining the body and analyzing the evidence, investigators believe that the body decomposition is not typical and a PMI will be difficult to determine. The condition of the body was likely affected by _____.
The pH of the soil being lower than 3.5.
Victim was recently in, or near, a river or fast-moving stream
A body is found beneath an overpass in a metropolitan area. Soil found on the body is analyzed and compared to soil at the scene. The soil found beneath and around the body contains significant organic matter and minerals with rounded edges. The soil recovered from the skin of the body has little organic matter and a higher mineral content. During the physical analysis, both large and small granules and rock fragments are found in the soil found on the body. The physical analysis of the soil evidence most likely indicates that the _____.
Victim was recently in, or near, a river or fast-moving stream
