Handbook of Forensic Services (pdf) - FBI

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Handbook of Forens c Serv ces 2007 subm ss on d rect ons, nclud ng Requesting Evidence Examinations and Packaging and Shipping Evidence. ß Pack nk ev dence separately from any document or surface w th nk marks. Back to the top Latent Print Examinations Case Acceptance Policy Because of the ncreas ng casework demands of the FBI’s pr mary m ss on, protect ng the Un ted States from terror st attacks, the FBI Laboratory w ll no longer accept rout ne cases from state and local agenc es n wh ch latent pr nt exam nat on serv ces may be obta ned from w th n the subm tt ng agency’s system. The future acceptance of any state and local cases generally w ll be based on the subm tt ng agency’s lack of access to the same techn ques or serv ces prov ded by the FBI Laboratory, the unusual techn cal nature of the case, or the c rcumstances surrounding the case, e.g., cases of a high-profile nature or cases that also involve FBI field offices. Developing Latent Prints at Crime Scenes The Laboratory s the best place to develop latent pr nts; however, t s somet mes necessary to 80
Handbook of Forens c Serv ces 2007 develop latent pr nts at cr me scenes. Caut on should be taken to prevent destroy ng latent pr nts. The follow ng measures ensure that cr me scene latent pr nts are protected: ß ß ß ß ß ß Photograph latent pr nts pr or to any process ng. Exam ne all ev dence v sually and w th a laser or an alternate l ght source before us ng any other latent pr nt development process. Photograph latent pr nts developed w th fingerprint powders before lifting them. Black, gray, or wh te powder can be appl ed to a surface w th a var ety of style of brushes. The color of the powder should contrast w th the color of the surface (e.g., black for l ght surfaces and gray or wh te for dark surfaces). Use a short-ha r brush or cotton to remove excess powder. Use caut on when powder ng. Avo d overbrush ng latent pr nts and los ng clar ty. Use transparent tape or black-and-wh te rubber l fts to l ft latent pr nts. 81
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