Cavness Shannon, Choudhury Asha, Sensabaugh George
Criminalistics Division, Oakland Police Department, 455 7th Street, Oakland, CA.
J Forensic Sci. 2014 May;59(3):729-34. doi: 10.1111/1556-4029.12398. Epub 2014 Mar 3.
Many protocols for the examination of sexual assault victims include the preparation of vaginal wet mount slides to determine whether sperm are present and if so, whether the sperm are motile. We have reviewed findings in 501 case reports to compare the efficiency of sperm detection on wet mounts to subsequent crime laboratory results of sperm searches on vaginal swabs. Sperm were detected on wet mounts in only 41% of cases in which sperm were detected in the crime laboratory. Motile sperm were observed in only 12% of cases reporting a 0-9 h postcoital interval; in three cases, motile sperm were seen at 15 h and beyond, indicating that motile sperm are not reliable evidence of a short postcoital interval. These findings demonstrate that wet mount examinations are of little value in guiding subsequent analyses in the crime laboratory or in corroborating other investigative aspects of the case.
许多性侵受害者检查方案都包括制备阴道湿片以确定是否存在精子，若存在精子，还要确定其是否具有活动能力。我们回顾了501例病例报告的结果，以比较在湿片上检测精子的效率与随后犯罪实验室对阴道拭子进行精子检测的结果。在犯罪实验室检测到精子的病例中，只有41%在湿片上检测到了精子。在报告性交后间隔时间为0 - 9小时的病例中，仅12%观察到有活动精子；在3例病例中，在15小时及以后观察到有活动精子，这表明活动精子并非性交后间隔时间短的可靠证据。这些发现表明，湿片检查在指导犯罪实验室的后续分析或证实案件的其他调查方面价值不大。
