Handbook of Forensic Services (pdf) - FBI

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Handbook of Forens c Serv ces 2007 Building Materials Examinations Exam nat ons can compare bu ld ng mater als such as br ck, mortar, plaster, stucco, cement, and concrete. Questions concerning building materials evidence should be directed to 703-632-8449. Follow the ev dence subm ss on d rect ons, nclud ng Requesting Evidence Examinations and Packaging and Shipping Evidence. ß ß ß When bu ld ng mater als are penetrated or damaged, debr s can adhere to people, cloth ng, tools, bags, and stolen tems and can transfer to veh cles. If poss ble, subm t the ev dence to the Laboratory for exam ners to remove the debr s. Package each tem of ev dence n a separate paper bag. Do not process tools for latent pr nts. Collect known samples from the penetrated or damaged areas. Sh p known and quest oned debr s separately to avo d contam nat on. Subm t known and quest oned debr s n leakproof conta ners such as film canisters or plastic pill bottles. Do not use paper or glass conta ners. Pack to keep lumps ntact. 22
Handbook of Forens c Serv ces 2007 Bullet Jacket Alloy Examinations Elemental analys s of bullet jackets can be done when a bullet has fragmented so that nd v dual p eces cannot be used for compar son w th testfired ammunition from a firearm or in the absence of a firearm or the lead component of the bullet. Th s analys s may be helpful when there are mult ple shooters and types of jacketed ammunition. Alloy classification can differentiate among bullet jacket alloys of d fferent manufacturers or among the bullet jacket alloys n manufacturers’ product on l nes. Questions concerning bullet jacket alloy examinations 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 Ammun t on components such as bullets, cartr dge cases, and shotshell cas ngs can be sent v a Reg stered Ma l through the U.S. Postal Serv ce. Ev dence must be packaged separately w th the date, t me, locat on, collector’s name, case number, and ev dence number wr tten on the conta ner. 23
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