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?
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.