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通过使用LA-ICP-MS数据,进行实验室间研究,评估背景数据库,以计算车辆玻璃证据解释的概率比率

Katelyn Lambert¹, Anuradha Akmeemana², David Almendro³

¹Department of Chemistry and Biochemistry, and Center for Advanced Research in Forensic Science, Florida International University, Miami, FL, USA.

Forensic science international

|March 26, 2025

概括

这项研究评估了法医车辆玻璃分析,使用激光剥离感应合血质谱法 (LA-ICP-MS) 和标准方法 (ASTM E2927-23). 结果表明,标准方法和概率比率 (LR) 计算对于比较玻璃证据都是有效的.

科学领域:

法医科学法医科学法医科学
分析化学分析化学
材料科学材料科学材料科学

背景情况:

车辆玻璃分析在法医调查中至关重要.
标准化方法和统计方法提高了证据的解释.
激光切除感应合等离子体质谱法 (LA-ICP-MS) 是玻璃元素分析的一个关键技术.

研究的目的:

为了评估ASTM E2927-23标准方法的性能,用于法医车辆玻璃比较.
评估概率 (LR) 计算在报告玻璃证据的意义上的有效性.
探索不同数据库对 LR 计算对案例工作场景的影响.

主要方法:

一项涉及13个实验室的实验室间研究,使用LA-ICP-MS.分析玻璃样本.
应用ASTM E2927-23标准测试方法进行玻璃比较.
使用五个数据库计算两种案例情景的概率比率 (LRs).

主要成果:

在ASTM E2927-23和LR计算中,在区分相同来源和不同来源的玻璃样本方面都显示出高准确度.
LR计算为相同来源 (LR ≈ 10,000) 和不同来源 (LR ≈ 0.0001) 的命题提供了强有力的支持.
化学上相似的玻璃样本带来了挑战,导致误导证据的比例更高,特别是在不同来源的比较中.

结论:

该研究验证了ASTM E2927-23标准和LR计算对于法医车辆玻璃分析的可靠性.
LR计算提供了一个强大的统计框架,用于量化玻璃比较的证据权重.
仔细考虑样本相似性和数据库组成对于准确解释法医玻璃证据至关重要.

关键词:

以及概率比率.法医分析法医分析玻璃比较解释的解释在LA-ICP-MS中使用.

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