Trace Evidence Lab : Hair Vs Fibers

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Trace Evidence Lab: Hair vs fibers
Gavin O’Connor and Christian Wilder
Bourgade Catholic High School
Forensic Science (7)

Background Information Trace evidence- very small amounts of certain physical evidence that is found at a crime scene. Example of trace evidence include blood, hair particles, glass, gunpowder and fingernails. The different types of trace evidence are biological and physical. Biological evidence are samples collected at a crime scene that contain biological material. Examples of biological evidence include hair, tissue, bones, teeth, blood, semen or other bodily fluids or evidence containing biological material. Physical evidence is any item that comes from a nonliving origin. Examples of physical evidence includes fingerprints, footprints, tire marks, fibers, paints and building materials. The importance of trace evidence in forensic science specifically hairs and fibers are that they contain DNA, which can be traced back to the origin. An important figure in the history of forensic science was Edmond Locard who came up with the transfer of evidence. He called this Locard’s exchange principle which means that when two objects come into contact with one another a cross-transfer of materials occurs. An example of Locard’s exchange principle can be when jean fibers come into contact with a computer chip and a transfer of materials occurs. In this example Locard’s exchange principle relates to

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