常见洗手方式对92式手枪射击残留物检出率的影响

目的研究常见洗手方式对92式手枪射击残留物检出率的影响，为确定犯罪嫌疑人射击与否的推断提供依据。方法实验人员使用92式手枪分别射击1枪和3枪，射击后0．5h内，射击人员的手分别用清水、肥皂和洗手液清洗3遍（对照组为未清洗），对实验人员的手部进行射击残留物的提取，利用扫描电镜和能谱仪对射击残留物进行检验。结果持枪射击后，射击人的手部会附着大量的射击残留物，用常见的洗手方式进行清洗后，仍然能检测到射击残留物，且不同的洗手方式对射击残留物的检出率的影响差异显著。结论常见洗手方式不能完全清除手部的射击残留物，对涉枪案件犯罪嫌疑人的判定有一定的参考价值。

Effects of hand washing on detection of gunshot residues

Objective To investigate the effects of hand washing on detection of gunshot residues particles. Methods 24 experimenters fired with pistol were divided into four groups. The members of one group didn＇t wash their hands, the members of other three groups washed their hands with water, washing liquid, and soap, respectively. After then, Gun shot residue samples were collected from all experimenters＇ hands and examined by SEM/EDX. Results The average of gun shot residue particles for each group was 70, 37, 6 and 3. Conclusion Gun shot residue particles can be detected from washed hands, but the amount of particles will reduced after hand washing, especially the hands were washed with soap.