Forensic Science

8 August 2016

What physical evidence did you find at the victim’s home? I found a box of matches, alcohol, space heater, a wallet, 2. 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? I took a chippel and chipped some of the wood off the floor and picked up the chippings with tweezers and put the chips in a container. I also took portions from part of the wood that wasn’t chipped to assure the different chemicals used on the wood. 3.

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What evidence did the space heater provide? What did the evidence indicate? The evidence that the space heater provided was that someone burned it making it that someone used the space heater to create enough heat for an explosion. 4. What information did you gain from the pictures taken at the scene? I gained knowing where all the evidence was from taking pictures at the scene. 5. 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?

The fingerprints on the match box belonged to Donald Parker. The characteristics of the loop helped me determine they were a match, The average IAFIS search takes two hours. 6. 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? The charcoal strip will absorb any vapors in the air space. The pieces saved after the solution has been prepared for the GC because they need to see what chemical was used in the fire to that was absorbed in the wood.

What elements were present in the gas chromatograph from your puddle sample? How did this differ from the control graph? The elements that were present in the gas chromatograph were gasoline, wood burner, and much more. The only difference between the puddle sample and the control graph was the gasoline levels were different. 8. 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?

When preforming the autopsy if the victim died in the fire you have to look for soot in the moth, If it goes over 55% of carboxyhemoglobin in the blood then you die. 9. 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. The evidence helped determine how trevor died by showing it was accidental and that the certain things wouldn’t have happened if it was on purpose.

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