Handbook of Forensic Services (pdf) - FBI

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Handbook of Forens c Serv ces 2007 Questions concerning special-event and situational awareness support should be directed to 703-632-8194. Tape Examinations Tape compos t on, construct on, and color can be compared w th known sources. Compar sons can be made w th the torn end of tape and a suspect roll of tape. The Laboratory w ll exam ne duct, v nyl electr cal, packag ng, mask ng, and cellulose acetate (e.g., Scotch) tapes. Questions concerning tape evidence should be directed to 703-632-8441. Follow the ev dence subm ss on d rect ons, nclud ng Requesting Evidence Examinations and Packaging and Shipping Evidence. ß Whenever poss ble, subm t tape st ll adhered to the substrate. Th s m n m zes the loss of trace evidence, latent fingerprints, or contact mpress ons. If t s not poss ble to subm t the substrate, the tape may be manually removed and placed adhes ve s de down on a clean, colorless p ece of plast c sheet ng (e.g., transparency film or Kapak tubular rollstock), 134
Handbook of Forens c Serv ces 2007 not on cardboard, paper, or v nyl document protectors. Do not d stort or tear the tape dur ng removal. ß If the tape s cut dur ng removal, document and n t al each cut. Use a method that produces a un que cutt ng pattern (e.g., p nk ng shears). Back to the top Toolmark Examinations Toolmarks Tools can bear un que m croscop c character st cs because of manufactur ng processes and use. These character st cs can be transferred to surfaces that had contact w th the tools. Ev dence toolmarks can be compared w th recovered tools. In the absence of a quest oned tool, toolmark exam nat ons can determ ne the type of tool(s) that produced the toolmark and whether the toolmark s of value for compar son. Toolmark exam nat ons also nclude lock-and-key exam nat ons. Fractures Fracture exam nat ons somet mes can be used to determ ne whether ev dence was jo ned together and subsequently broken apart. 135
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Handbook of Forensic Services (pdf) - FBI

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