8 August 2016

HeΒ v-shaped pattern often occurs in the area where a fire originated, so it is possible that the space heater was the fire of origin (tests needs to be run to confirm). The crazed glass (by lab results) indicated that crazing is the result of rapid cooling of hot glass by the application of water. The protected surface shows there was an object on the floor protecting the area, What physical evidence did you find at the victim’s home? Describe the process that you used to take a sample of the puddle-shaped burn pattern on the floor.

Why did you also take samples from the portion of the floor that was not burned? What evidence did the space heater provide? What did the evidence indicate? What information did you gain from the pictures taken at the scene? To whom did the fingerprints on the match box belong? What characteristics of the fingerprints helped you to determine they were a match? How long does the average IAFIS search take? Why is there a charcoal strip inside the containers that you used to collect the floor pieces? Why are these pieces saved after the solution has been prepared for the GC?

What elements were present in the gas chromatograph from your puddle sample? How did this differ from the control graph? While performing the autopsy to determine if the victim died in the fire, what signs of inhalation did you look for? Based on the graph, what percentage of carboxyhemoglobin in the blood is deadly? How does the spectrometer work? What does the absorption of light waves help you to determine? How did you use the calibration curve to determine the blood alcohol content? Explain how the evidence helped you to determine how Trevor died and whether the fire was accidental or arson.

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