This week students got to examine evidence from a crime scene. A criminal is charged with shoplifting from a convenience store (stealing snacks and 30 gallons of gasoline). As he was committing the crime he carelessly left behind a trail of dirt. The store clerk also mentioned that the man drove a truck and the truck had the word "farm" on the drivers side door. Since there were no video surveillance tapes to help out all we had to go was a sample of dirt left behind and the truck clues. We found out that there were two farms in the area that have trucks with the word farm in the side. We got soil samples from each farm and compared the soil samples with the samples found at the crime scene. Using an indicator solution, we were able to tell how much organic matter was in each sample and narrow the farms down to one farm. This farm had one man working for them that fit the description given by the store clerk.
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