Handbook of Forensic Services (pdf) - FBI

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6. 7. 8. 9. Handbook of Forens c Serv ces 2007 Block out br ght amb ent l ght w th a sunscreen to max m ze the l ght from the flash. Focus on the bottom of the mpress on, not on the scale. Take an ex st ng- or reflected-light photograph. Position the flash at a very low angle (10–15 degrees) to the mpress on. Th s w ll enhance the deta l of the mpress on. For consistent exposure, hold the flash at least 5–7 feet from the mpress on. Shoot several exposures, bracket ng toward overexposure to obta n max mum mage detail. Move the flash two or more angles to the mpress on. Take the exposures, move the l ght to another pos t on, adjust the sunscreen, and repeat Steps 7 and 8. Impressions in Snow Impressions in snow are difficult to photograph because of lack of contrast. F rst, attempt to photograph the mpress ons as f n so l. To ncrease the contrast, l ghtly spray snow mpress ons w th Snow Pr nt Wax, a mater al used for cast ng snow mpress ons, or w th colored spray pa nt. Hold the spray can at least 2–3 feet 124
Handbook of Forens c Serv ces 2007 from the mpress on so the force of the aerosol does not damage the mpress on. D rect a l ght appl cat on of spray at an angle of about 30–45 degrees so the colored pa nt str kes only the h gh po nts of the mpress on. H ghl ghted mpress ons w ll absorb heat from the sun and must be sh elded unt l photographed and cast to prevent melt ng. Recovering the Original Evidence Whenever poss ble, subm t to the Laboratory the ev dence bear ng the or g nal mpress on. If the ev dence cannot be subm tted to the Laboratory, use the follow ng techn ques to recover the ev dence. Casting Three-Dimensional Impressions Cast ng a three-d mens onal mpress on n so l, sand, or snow s necessary to capture deta l for exam nat on. Dental stone, w th a compress ve strength of 8,000 ps or greater, must be used for cast ng all mpress ons. The compress ve strength s l sted on the conta ner along w th the proper rat o of powder to water used for m x ng. Dental stone s ava lable through local dental supply houses. Colored dental stone s preferred. Plaster of par s, model ng plasters, and dental plasters are not sufficiently hard, do not resist abras on when cleaned, and must not be used. 125
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Handbook of Forensic Services (pdf) - FBI

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