Handbook of Forensic Services (pdf) - FBI

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Handbook of Forens c Serv ces 2007 Bullets F red bullets can be exam ned to determ ne general rifling characteristics such as caliber, physical features of the rifling impressions, and the manufacturer of the bullets. The m croscop c character st cs on ev dence bullets can be compared with test-fired bullets from a suspect firearm to determine whether the evidence bullet was fired from that firearm. Cartridge Cases or Shotshell Casings Cartr dge-case or shotshell-cas ng exam nat ons can determ ne the cal ber or gauge, the manufacturer, and whether there are marks of value for compar son. The mages of quest oned cartr dge cases and shotshell cas ngs can be scanned nto the Nat onal Integrated Ball st c Informat on Network (NIBIN) to compare w th ev dence from other shoot ng nc dents. The m croscop c character st cs of ev dence cartr dge cases and shotshell cas ngs can be exam ned to determine whether they were fired from a specific firearm. Shot Pellets, Buckshot, or Slugs Exam nat ons of shot pellets, buckshot, or slugs can determ ne the s ze of the shot, the gauge of the slug, and the manufacturer. 64
Handbook of Forens c Serv ces 2007 Wadding Exam nat ons of wadd ng components can determ ne the gauge and the manufacturer. Unfired Cartridges or Shotshells Examinations of unfired cartridges or shotshells can determ ne the cal ber or gauge and whether there are marks of value for compar son. Exam nat ons also can determ ne whether the ammun t on was loaded n and extracted from a specific firearm. Unfired and fired cartridges or shotshells can be assoc ated through manufactur ng marks. Gunshot Residue on Victim’s Clothing The depos t on of gunshot res due on ev dence such as cloth ng var es w th the d stance from the muzzle of the firearm to the target. Patterns of gunshot res due can be dupl cated us ng a questioned firearm-and-ammunition combination fired into test materials at known distances. These patterns serve as a bas s for est mat ng muzzleto-garment d stances. Gun Parts Exam nat ons of gun parts can determ ne the cal ber and model of the gun from wh ch the parts or g nated. 65
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