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  • Contact: the physical touching of two persons or a person with an object. If contact is made, trace evidence can be exchanged
  • Cross-transfer: the shared exchange of something (hair, fibers, blood, etc.) between two people or objects that have come in contact with one another
  • Fiber: a thread-like piece of material that is the smallest unit of a woven fabric
  • Locard’s Exchange Principle: whenever two objects (or persons) come in contact, trace evidence will be exchanged between them
  • Man-made fibers: fibers made from materials other than plant or animal products, such as a combination of chemicals. Examples include nylon, polyester and satin
  • Natural fibers: fibers created from plant or animal products. Examples include cotton, linen, silk and wool
  • Primary transfer: the transfer of evidence directly from the source to another object
  • Secondary transfer: the transfer of evidence between objects where neither object was the original source
  • Trace evidence: small amounts of hair, skin, fabric, or any other material which may link a suspect to a crime scene