Handbook of Forensic Services (pdf) - FBI

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ß ß ß Handbook of Forens c Serv ces 2007 When transparent tape s used, the color of the back ng card should contrast w th the color of the powders (e.g., wh te back ng card for black powder). When us ng latent pr nt development processes, refer to the manufacturer’s nstruct ons and the Mater al Safety Data Sheets. Use personal protect ve equ pment (e.g., safety glasses, masks, gloves, smocks). The Processing Guide for Developing Latent Prints s a comprehens ve gu de to latent pr nt processes and protocols. Refer to th s publ cat on to ensure that proper processes are appl ed n the recommended order. Follow ng th s gu de w ll max m ze the potent al to develop latent pr nts and w ll preserve ev dence f other forens c exam nat ons are requ red. The gu de s ava lable at http://www.fbi.gov/hq/lab/fsc/ backissu/jan2001/lpu.pdf. Law enforcement personnel may request the Processing Guide for Developing Latent Prints in field-manual format by fax ng a request on agency letterhead to 703-632-8374. Photographing Latent Prints ß Use a tr pod and cable release when photograph ng latent pr nts. 82
ß ß ß ß ß ß Handbook of Forens c Serv ces 2007 Use a 35 mm or med um-format camera w th a macro lens capable of half-s ze to full-s ze reproduct on. Photograph latent pr nts at each step n the process ng sequence before mov ng to the next process. Photograph latent pr nts developed w th fingerprint powders before lifting them. When possible, use ISO 400 film. Set the lens f-stop to the smallest poss ble aperture wh le us ng the camera meter to adjust the camera’s shutter speed to obta n proper exposure. Take three exposures of each latent pr nt by bracket ng: ü ü ü Or g nal exposure. One-stop underexposed mage. One-stop overexposed mage. Photograph latent pr nts nd v dually. Th s ensures that the target latent pr nt s n focus. 83
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