A massive fish kill has occurred in the town of Raymond. The townspeople are in an uproar, and extensive efforts are underway to determine why the fish are dying. It is up to your students to take the role of forensic scientists and determine who is responsible. Students will use nitrate and phosphate tests to determine the culprit. Use this great problem-based learning activity to build student interest and let them see how science is used in everyday life. A variety of possible scenarios are presented, and the outcome may be changed from class to class. Includes extensive background information and all the testing materials needed to crack the case.