Henry C. Lee College of Criminal Justice and Forensic Science, Forensic Science Department, University of New Haven, West Haven, CT, USA.
School of Criminal Justice and Criminalistics, California Forensic Science Institute, California State University, Los Angeles, CA, USA.
J Forensic Sci. 2021 Jul;66(4):1472-1481. doi: 10.1111/1556-4029.14710. Epub 2021 Apr 23.
Fingermark ridge drift is a random modification of (aged) fingermark patterns at a ridge scale. This phenomenon was previously proven to alter key elements used for identifications, such as the appearance of minutiae. Little is currently reported on the underlying factors contributing to its occurrence. The present study was designed to investigate further the variables of a previous study by including a total of 768 fingermarks from a male and female, two substrates (glazed ceramic tile and plastic), two distinct color powder developers (carbon black and titanium dioxide), three indoor lighting conditions (direct natural light, shade, and darkness), and two secretion types (sebaceous- and eccrine-rich). Fingermarks were aged for 2-72 days, powdered, photographed, and drift detected by three independent observers. All aged fingermarks (672) were compared relative to fresh fingermarks (96), and ridge drift was observed in 42 of 672 (6%) fingermarks, while 168 (25%) were reported as indeterminate results. While ridge drift was detected in multiple fingermarks across all independent variables, statistical analysis using a multinomial logistics model showed that only powder type, secretion type, and the substrate indicated a significant correlation with increased incidences of this phenomenon. There was no significant correlation with the donor, time since deposition, or the environmental lighting conditions used. The highest incidence occurred when carbon black powder was used on a plastic substrate (>10%). The average observation of ridge drift is 6% of samples supporting that this phenomenon is not a rare event, particularly considering the conservative analysis approach implemented.
指纹嵴纹漂移是指纹嵴纹图案在嵴纹尺度上的随机改变。 先前已经证明这种现象会改变用于识别的关键要素，例如细节的出现。 目前关于导致其发生的潜在因素的报道很少。 本研究旨在通过包括来自男性和女性的总共 768 个指纹、两种基质（釉面瓷砖和塑料）、两种不同的彩色粉末显影剂（炭黑和二氧化钛）、三种室内照明条件（直接自然光、阴影和黑暗）以及两种分泌类型（皮脂丰富和汗腺丰富）来进一步研究先前研究的变量。 将指纹老化 2-72 天，粉末化，拍照，并由三位独立观察者检测漂移。 将所有老化指纹（672 个）与新鲜指纹（96 个）进行比较，并在 672 个指纹中有 42 个（6%）观察到嵴纹漂移，而 168 个（25%）被报告为不确定结果。 尽管在所有独立变量中都检测到了多个指纹的嵴纹漂移，但使用多项逻辑回归模型进行的统计分析表明，只有粉末类型、分泌类型和基质与这种现象发生率的增加有显著相关性。 与供体、沉积后时间或使用的环境照明条件没有显著相关性。 当在塑料基质上使用炭黑粉末时，发生率最高（>10%）。 对嵴纹漂移的平均观察结果为 6%的样本支持这种现象并非罕见事件，特别是考虑到实施的保守分析方法。
