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Examination of Textile Fibers (Virtual Lab)

Pre-Lab Questions

      Describe the 2 classifications of fibers, natural and manufactured.

      Name two analytical devices used by forensic scientists to determine the class of a fiber.

      What is the first and most important step in the examination of fiber? What physical characteristics of fiber might help an examiner identify it?

      How can micro spectrophotometry and chromatography be used to analyze fiber evidence?

      Explain how the following examination techniques can be used to distinguish between fibers and explain why these techniques are not used often in CSI. (Physical Match & Micro-Chemical Test)

      Identify each of the following fiber samples based on the following class characteristics WOOL, COTTON, POLYSTER, or NYLON


A.   Description: cotton2_100X

B.   Description: nylon

C.   Description: wool2

D.   Description: poly2



Scenario: Summarize the case/crime scene. Explain the collection and preservation methods for fiber samples.


Problem: Using the scenario develops the problem being investigated.

Researched-based Hypothesis: Based on knowledge of forensic microscopy and physical evidence, develop a researched based hypothesis.

Procedures: Summarize the procedures for each exercise.

Data and Results: Provide the data and/or drawings for each experiment (even if it has no data sheet provided), if data sheets are provided add the information to the data section.

Discussion (Data Analysis): This section shows that you understand the experiment beyond the simple level of completing it. Explain, Analyze and interpret the data based on forensic science theories, test and classifications of evidence. Also, based on the evidence/data collected specifically, state how the evidence/data provides valuable scientific information for solving the crime in the scenario.

Forensic Application & Conclusions: Simply state the results of the lab. Describe how these results support or disprove the hypothesis. Also, based on the results, provide an expert witness testimony from the perspective of a forensic scientist.