Handbook of Forensic Services (pdf) - FBI

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Handbook of Forens c Serv ces 2007 and suspect(s). A quest oned p ece of fabr c can be matched phys cally to known fabr c. Fabr c compos t on, construct on, and color can be compared, and mpress ons on and from fabr c can be exam ned. Label searches can determ ne cloth ng manufacturer nformat on. Questions concerning hair and fiber evidence should be directed to 703-632-8449. Follow the ev dence subm ss on d rect ons, nclud ng Requesting Evidence Examinations and Packaging and Shipping Evidence. ß For known ha r samples, collect at least 25 ha rs from d fferent parts of the head and/or pub c reg on. Comb and pull out the ha rs. Subm t ha rs n clean paper or an envelope w th sealed corners. ß When poss ble, subm t the ent re garment or textile. Submit fibers in clean paper or an envelope w th sealed corners. Back to the top Image Analysis Examinations Image analys s exam nat ons are conducted by the FBI’s Operat onal Technology D v s on (OTD), D g tal Ev dence Laboratory (DEL), Forens c Aud o, V deo, and Image Analys s Un t (FAVIAU). 72
Handbook of Forens c Serv ces 2007 The OTD DEL has d fferent acceptance cr ter a and a d fferent phys cal address than the FBI Laboratory, as descr bed below. Photographic Comparisons Examinations of film, negatives, digital images, photograph c pr nts, and v deo record ngs, nclud ng surve llance mages, nvolve compar sons of subject(s) or object(s) dep cted n quest oned mages w th those n known mages. Subject(s) or object(s) also can be compared between mult ple quest oned mages. Subject compar sons nclude fac al compar sons or can be made between l ke body parts, such as hands or ears. Examples of objects that can be compared include clothing, firearms, and vehicles. Photogrammetry Phys cal d mens ons can be der ved from mages through the use of geometr c formulas or on-s te compar son. For on-s te compar sons, exam ners enter the scene and place a he ght chart at the locat on of the subject(s) or object(s) of nterest. Examples of photogrammetry nclude determ n ng the he ght of a bank robbery subject(s) and the length of the weapon(s) used by the subject(s) dep cted n surve llance mages. 73
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