Handbook of Forensic Services (pdf) - FBI

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Handbook of Forens c Serv ces 2007 Questions concerning toolmark evidence should be directed to 703-632-8442. Follow the ev dence subm ss on d rect ons, nclud ng Requesting Evidence Examinations and Packaging and Shipping Evidence. ß ß If poss ble, subm t the tool-marked ev dence. If t s not poss ble to subm t the tool-marked ev dence, make a cast to subm t to the Laboratory. 1. 2. 3. 4. Use an acryl c-surface repl ca cast k t. Call the Laboratory at 703-632-8442 regard ng the appropr ate cast k t. D fferent formulas are used n d fferent temperatures. If poss ble, move the ev dence to a warm area. Casts w ll dupl cate fore gn mater al n the stamped characters. Clean the area before proceed ng. Remove pa nt and d rt w th a solvent such as acetone, gasol ne, or pa nt remover. Use Naval Jelly to remove rust. Use a soft brush. Do not use a w re brush. Bu ld a dam around the stamped characters to reta n the acryl c l qu d 136
ß ß ß 5. 6. 7. 8. Handbook of Forens c Serv ces 2007 wh le t hardens. Use a soft and pl able dam mater al such as model ng clay. Ensure there are no vo ds n the dam. Follow ng the nstruct ons n the k t, m x the l qu d and powder for one m nute and pour the m xture nto the dam. The acryl c l qu d w ll take 30 m nutes to harden. Remove the cast when t s hard. If pa nt and rust are on the cast, make add t onal casts and subm t the cleanest one to the Laboratory. Ind cate where on the object (often a veh cle) the cast was taken. Pack the cast to prevent breakage. Photographs locate toolmarks but are of no value for identification purposes. Obta n samples of any mater al depos ted on the tools. Subm t samples n leakproof containers such as film canisters or plastic pill bottles. To avo d contam nat on, do not place the tool aga nst the tool-marked ev dence. 137
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