Gassner Anne-Laure, Manganelli Manuela, Werner Denis, Rhumorbarbe Damien, Maitre Matthieu, Beavis Alison, Roux Claude P, Weyermann Céline
Institut de Police Scientifique, University of Lausanne, Batochime, 1015 Lausanne, Switzerland.
Institut de Police Scientifique, University of Lausanne, Batochime, 1015 Lausanne, Switzerland.
Sci Justice. 2019 Jan;59(1):58-66. doi: 10.1016/j.scijus.2018.08.007. Epub 2018 Sep 1.
The present study aimed at providing data to assess the secondary transfer of organic gunshot residues (OGSR). Three scenarios were evaluated in controlled conditions, namely displacing a firearm from point A to point B, a simple handshake and an arrest involving handcuffing on the ground. Specimens were collected from the firearm, the hands of the shooter and the non-shooter undergoing the secondary transfer in order to compare the amounts detected. Secondary transfer was observed for the three scenarios, but to a different extent. It was found that displacing a firearm resulted in secondary transfer in <50% of the experiments. The firearm also had an influence, as contrary to the pistol, no secondary OGSR were detected using the revolver. Shaking the hand of the shooter also transferred OGSR to the non-shooter's hand. In that case, the amount of OGSR was generally higher on the shooter than on the non-shooter. Finally, the largest secondary transfer was observed after the arrest with handcuffing with positive results in all cases using the pistol. In that scenario, the amounts on the shooter and the non-shooter were in the same range. This study highlights that the secondary transfer must be taken into account in the interpretation of OGSR. Indeed, an individual's hands might be contaminated by handling a firearm or having physical contact with a shooter.
本研究旨在提供数据，以评估有机枪击残留物（OGSR）的二次转移情况。在受控条件下评估了三种情形，即将枪支从A点移至B点、简单握手以及涉及在地面上手铐铐住的逮捕过程。从枪支、经历二次转移的射手和非射手的手上采集样本，以便比较检测到的量。在这三种情形中均观察到了二次转移，但程度不同。发现移动枪支在不到50%的实验中导致了二次转移。枪支也有影响，与手枪不同，使用左轮手枪未检测到二次OGSR。与射手握手也会将OGSR转移到非射手手上。在这种情况下，射手手上的OGSR量通常高于非射手。最后，在使用手枪进行铐住逮捕后观察到最大程度的二次转移，所有情况下结果均为阳性。在该情形中，射手和非射手手上的量处于相同范围。本研究强调，在解释OGSR时必须考虑二次转移。确实，个人的手可能会因处理枪支或与射手有身体接触而受到污染。
