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National Research Institute of Police Science, 6-3-1 Kashiwanoha, Kashiwa, Chiba 277-0882, Japan sugita{at}nirps.go.jp
Soil is presented as evidence as a mixture of both natural and artificial materials. Unique particles found in soil may provide useful information to indicate the origin of the soil and, when found in soil evidence, may provide rapid discrimination between samples. Evidence in poor condition may also be examined for these diagnostic particles. This paper describes some case examples and research, involving geological particles, plant fragments and algae, in which microscopy played an important role.