Schotman Tom G, van der Weerd Jaap
Netherlands Forensic Institute, Department of Microtraces, P.O. Box 24044, 2490AA The Hague, The Netherlands.
Netherlands Forensic Institute, Department of Microtraces, P.O. Box 24044, 2490AA The Hague, The Netherlands.
Sci Justice. 2015 Dec;55(6):415-21. doi: 10.1016/j.scijus.2015.05.007. Epub 2015 Jun 16.
The recovery of fibre traces via tape lifting, tape scanning and manual isolation is investigated. The recovery efficiency of taping was determined using different tapes, donor textiles, and receptor textiles. It was determined that tape lifts generally recover over 90% of extraneous fibres that had been transferred by direct contact with a donor textile. The recovery via tape scanning was evaluated by the preparation of a set of 15 tapes that contained a number of target fibres on a background of other fibres. The tapes presented varying difficulty and were investigated by trained fibre examiners. The examiners were asked to locate the target fibres and to provide their opinion on the difficulty of the search. As expected, the efficiency decreases for more difficult searches. It was determined that the efficiency of the search was influenced by the microscopic illumination modes used by the examiner. A final experiment investigated the recovery by manual isolation of fibres from non-textile items. It was determined that all fibres from tie cables and knives were recovered, except in those cases where the recipient item contained many fibres. In addition, the examiners correctly sampled each of three fibre populations present on a sample of duct tape.
本文研究了通过胶带粘贴、胶带扫描和手工分离来回收纤维痕迹的方法。使用不同的胶带、供体纺织品和受体纺织品来确定胶带粘贴的回收效率。结果表明，通过胶带粘贴通常能够回收超过90%通过与供体纺织品直接接触而转移的外来纤维。通过制备一组15条胶带对胶带扫描回收情况进行评估，这些胶带在其他纤维的背景上含有若干目标纤维。这些胶带呈现出不同的难度，并由经过训练的纤维检验员进行研究。检验员被要求找出目标纤维，并就搜索的难度发表意见。正如预期的那样，对于更困难的搜索，效率会降低。研究发现，搜索效率受检验员使用的微观照明模式影响。最后一个实验研究了从非纺织品物品中手工分离纤维的回收情况。结果表明，除了接收物品含有许多纤维的情况外，来自扎带电缆和刀具的所有纤维都被回收了。此外，检验员正确地对胶带样本上存在的三种纤维群体中的每一种进行了采样。
