Handbook of Forensic Services (pdf) - FBI

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ß Handbook of Forens c Serv ces 2007 Ha rs that are su table for m croscop c compar son purposes but, for val d reasons, are not su table to compare w th the pert nent reference sample (e.g., ha r depos ted 10 years pr or to the collect on of the reference ha r sample, reference sample s from an individual whose hair is artificially treated after the cr me date). Regardless, the ha r must be probat ve. Unidentified Human Remains Pr or to mtDNA analys s, bone or teeth spec mens should be exam ned by a forens c anthropolog st or odontologist or a similarly qualified individual. Subm ss ons of such tems should be accompanied by a written report that verifies human origin by a qualified expert. Documenting, Collecting, Packaging, and Preserving DNA Evidence If DNA ev dence s not properly documented, collected, packaged, and preserved, t w ll not meet the legal and scientific requirements for adm ss b l ty n a court of law. ß If DNA ev dence s not properly documented, ts or g n can be quest oned. 44
ß ß ß Handbook of Forens c Serv ces 2007 If t s not properly collected, b olog cal act v ty can be lost. If t s not properly packaged, contam nat on can occur. If t s not properly preserved, decompos t on and deter orat on can occur. When DNA ev dence s transferred by d rect or secondary ( nd rect) means, t rema ns on surfaces by absorpt on or adherence. In general, l qu d b olog cal ev dence s absorbed nto surfaces, and sol d b olog cal ev dence adheres to surfaces. Collect ng, packag ng, and preserv ng DNA ev dence depends on the l qu d or sol d state and the cond t on of the ev dence. The more ev dence reta ns ts or g nal ntegr ty unt l t reaches the Laboratory, the greater the poss b l ty of conduct ng useful exam nat ons. It may be necessary to use a var ety of techn ques to collect suspected body-fluid evidence. Collecting Known Samples Blood ß Only qualified medical personnel should collect blood samples from a person. 45
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