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Evidence Locker
The postcard below is from a famous unsolved crime.  A suspect in the case was being questioned by police at a hotel along the route from Las Vegas to Los Angeles.  He claimed that he was kidnapped by police.  He wrote this postcard and threw it out a window.  Look at this item and see how you might evaluate it.  What types of evidence might we find?  Do you notice anything that stands out as odd?
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Soil analysis can be an important part of forensic investigations, from illegal dumping and spills to analysis of soil on a suspect’s shoes or tires.  The following image shows the results of analysis on a soil sample that we recently used in setting up an experiment about the movement of blood through soil.  Needless to say, we got quite a surprise with the results of this analysis.  Lead and Arsenic aren’t my favorite substances.