Transcription of Forensics Fiber Analysis - Weebly
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Forensics Fiber Analysis - Weebly
Fiber Analysis Fibers Individual or Class Evidence? Class Even if fibers from two separate places can be matched via comparison, that does not mean they derive from the same source Direct Transfer: from victim to suspect or from suspect to victim Ex. from suspect's sweater to victim Secondary Transfer: when fibers are transferred from an original source to one person and then to a second person. Ex. Carpet (fibers) Victim Victim Suspect Ex. Pet (fur) Suspect Suspect Victim Fibers are Time-Sensitive! Within 24 hours, 95% of all fibers have been lost from a crime scene. What Questions Do forensic Scientists Ask Come up with at least 5. Questions! about Fibers? 1) What is its composition? 2) What is its color? 3) Is it common or rare? 4) How many fibers were found? 5) Where were the fibers found? 6) What type of textile did the Fiber originate from?
Lab - Fiber Burn Test • Materials – Obtain one fiber at a time from the front of the room. • Safety – Keep all papers away from the flame. – Hold fiber with tweezers. – Use the aluminum foil to place fiber remains. • Disposal – Throw away used match, aluminum foil, & fiber remains. – Place everything else back into the basket.
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