Most arson cases are prosecuted as circumstantial evidence cases. In preparing a case for trial, the prosecutor should begin at the fire scene itself, with the fire marshal's information. Care should be taken in presenting the marshal as an expert witness. The testimony should cover the fire investigator's reasons for ruling out accidential causes. Wherever possible, photographs should be used to help the jury understand the extent of the fire's damage. Samples taken at the fire scene are essential to a strong case. Specific types of fires are discussed from the perspective of prosecuting the defendant, who often can be charged with reckless endangerment as well as arson. The speaker discusses who should testify and why, and how prosecutors can bring images of the fire to the jurors' eyes to make them realize the fire's impact in terms of human life and damage. The three main elements to establish in a prosecution investigation are how the fire was set, that the defendant set the fire, and the motive (why the defendant set the fire). The ramifications of several court rulings are discussed, including the Michigan v. Tyler decision and the Sibbles case in New York. Questions and answers occur during the seminar.