Crime lab science

Crime lab science

Case Scenario Part IV

Sudbury, MA State Police Crime Laboratory

July 20, 2017

The body found at the Malden location has been taken to the State Medical Examiner’s Office for an

autopsy and processing. It appears that the victim has been shot although the cause of death has

not yet been determined. Meanwhile, police have found the victim’s home burned to the ground

and suspect that arson might have occurred.

Please answer the following questions with regard to the victim (questions 1-15 are 5 pts each,

question 16 is 25 pts) .

  1. The medical examiner performs a visual examination of the body and finds a bullet entrance

wound. There appears to be a ring of deposited smoke and lead as a halo around the bullet

hole. What would be the approximate distance from which the bullet was shot?

  1. The medical examiner swabs an area near the entrance wound. She is trying to determine if

there is GSR near the wound. List three elements that might be present in GSR. What are the

chemical symbols for these elements? How many protons, neutrons, and electrons do they

have?

  1. The medical examiner sends the swab to the inorganic analysis laboratory section. What

analytical technique might they use to simultaneously determine the three elements found in

question 2?

  1. The medical examiner has found an unknown metal object in the victim’s pocket. She requests

that the inorganic analysis laboratory section perform a non-destructive test on the metal to

determine the elemental composition. Which analytical technique might the lab choose?

  1. The metal in the victim’s pocket appears to have been melted and has a pink color. What

temperature do you expect the metal has been exposed to?

Arson investigators have gone to the scene of the victim’s house.

  1. A witness at the scene states that she saw smoke coming out of the window and called the fire

department. The fire department was there within 5 minutes and the house was completely

engulfed. Based on the fact that fire is a chemical reaction, why do you think the fire spread so

rapidly ?

  1. While the victim’s house has burnt down, the garage is intact. There are several cans of

kerosene there. Based on the flash point, how do you think this would compare to gasoline for

use as an accelerant? Which has the higher flashpoint?

  1. Based on the composition of gasoline and kerosene, why would gasoline be easier to ignite?
  2. What is the difference between the flash point and the ignition temperature?
  3. The house had a wooden frame. List two burn patterns that could be used to make a

determination as to the origin of the fire.

  1. Residue is found that needs to be taken back to the lab for analysis. How should the evidence

be transported?

  1. Prior to testing, the sample undergoes solid-phase micro extraction. Why is this technique

needed prior to testing?

  1. What is the purpose of the carrier gas in chromatography?
  2. What order do the components of the sample leave the chromatograph?
  3. Results of the gas chromatograph indicate that a combination of accelerants may have been

used. What technique might assist in determining the accelerants used?

  1. Research the assassination of John F. Kennedy https://www.youtube.com/watch?v=W-l23ec-

4mc

Write a 150-200 word summary focusing on one aspect of forensic analysis that was not available

when the assassination occurred 50 years ago (use at least two outside sources in your summary).

Consider at least one of the questions below in your response.

What are your thoughts regarding the case? Was there one shooter or multiple shooters? Was

there a “magic bullet”? What are your thoughts regarding the many conspiracy theories surrounding

the case (see http://www.cnn.com/2013/11/16/us/jfk-assassination-conspiracy-theories-debunked/

) for a short video and a list of the most popular conspiracy theories.

Use at least two outside sources in your response and cite using APA format.

https://www.youtube.com/watch?v=W-l23ec-4mc
https://www.youtube.com/watch?v=W-l23ec-4mc
http://www.cnn.com/2013/11/16/us/jfk-assassination-conspiracy-theories-debunked/

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