The activity listed below comes well into the middle of a unit study. Upon studying a "crime scene" and the evidence provided, the students are to take notes, study photos or drawings, look at suspect alibis and statements and then proceed to complete a number of lab tests looking at different aspects of evidence recovered. The students work in groups and then merge as an entire class; armed with data from the lab tests and enthusiasm, as well as hypotheses to solve the crime, if indeed there was a crime.