Handbook of Forensic Services (pdf) - FBI

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Handbook of Forens c Serv ces 2007 Photographing Shoe Print and Tire Tread Impressions General cr me scene photographs must be taken to relate the mpress ons to the cr me scene. Exam nat on-qual ty photographs then must be taken to obta n max mum deta l for forens c exam nat on and must nclude a scale. All mpress ons must be photographed us ng both methods. General Crime Scene Photographs General cr me scene photographs of shoe pr nt or t re tread mpress ons must nclude close-range and long-range photographs. ISO 400 color film should be used. The photographs must show the relat onsh p of the mpress ons to the surround ng area. General cr me scene photographs are not su table for footwear or t re exam nat ons. Examination-Quality Photographs Exam nat on-qual ty photographs must be taken d rectly over the mpress ons us ng a tr pod and l ght ng. A scale must be n every photograph. The purpose of these photographs s to produce a deta led negat ve that can be enlarged to natural s ze. Exam nat on-qual ty photographs must be taken as follows: 1. Place a l near scale such as a ruler next to and on the same plane as the 122
2. 3. 4. 5. Handbook of Forens c Serv ces 2007 mpress on. Place a label n the p cture to correlate the mpress on w th cr me scene notes and general photographs. Images should be taken us ng a 35 mm or medium-format film camera. Low-cost digital cameras do not provide sufficient mage deta l for exam nat on-qual ty photographs. Use a manual-focus camera. If the shoe pr nt s made from a colored substance (e.g., blood), color film may be preferable to black and wh te. In most amb ent-l ght s tuat ons, use ISO 100 film. Use ISO 200 or 400 film, if necessary. Place the camera on a tr pod and pos t on t d rectly over the mpress on. Adjust the he ght of the camera, and f poss ble, use a normal lens (50 mm for a 35 mm camera). F ll the frame w th the mpress on and scale. Pos t on the camera so the film plane is parallel to the mpress on. Set the f-stop on f/16 or f/22 for a greater depth of field. Attach an electronic flash with a long extens on cord to the camera. 123
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