Discussion
The control soil sample should be collected within the distance of _______ of the questioned soil spot.
Answer: B
The control (known) soil sample is taken from a spot close to the questioned soil, within about 3 to 4 inches of it, so that the two can be compared on a fair basis. A distance of 1 inch is too tight to give a sample that is independent of the questioned spot, and 8 inches or a foot are too far, since soil can change in colour and composition over a short distance. The 3 to 4 inches figure is the standard guidance followed in crime-scene practice.
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