Grade 8 and up. When an investigator enters a crime scene, it is extremely important not to destroy any form of trace evidence that might lead to the apprehension of the criminal in question. A close examination of a crime scene will often reveal impression evidence that has been left there by the perpetrator of the crime. This fact is based on the logic of the exchange principle by Edmund Locard. It is simply impossible to enter a location without changing it in some way, either by bringing something to it or by taking something from it. Footprints or shoe prints, tire tracks, or other impressions imbedded in soft material, if properly identified, preserved, and evaluated, may allow the crime scene investigator valuable class evidence. This type of evidence may not convict the wrongdoer, but may lead to their apprehension. Students actually get to become CSI detectives and perform many of the same duties, and solve the scenario in this kit, by using six different labs included. Kit contains: vials of carbon powder, small paintbrushes, plain paper stock, modeling clay, plaster of paris, teaspoons, five different ropes, magnifying glass, tongue depressors, tire impression pictures, small ink roller, ink, paper cups, soil, sifting screen, toothbrushes, pans, petri dishes, student's manual, assessment manual, instructor's manual, and MSDS.
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