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NCJRS Abstract

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NCJ Number: 222162 Find in a Library
Title: GSR2005--Continuity of the ENFSI Proficiency Test on Identification of GSR by SEM/EDX
Journal: Journal of Forensic Sciences  Volume:53  Issue:1  Dated:January 2008  Pages:162-167
Author(s): Ludwig Niewoehner Ph.D.; Jan Andrasko Ph.D.; Jan Biegstraaten B.Sc.; Lawrence Gunaratnam M.Sc.; Sylvia Steffen Ph.D.; Steffen Uhlig Ph.D.; Sabine Antoni M.Sc.
Date Published: January 2008
Page Count: 6
Type: Report (Study/Research)
Format: Article
Language: English
Country: United States of America
Annotation: Within the framework of the ENFSI Expert Working Group called "Firearms," a proficiency test was conducted on the detection and identification of gunshot residue (GSR) using energy-dispersive scanning electron microanalysis (SEM/EDX) over a period of 2 years; this paper focuses on the latest test, which was performed in 2005/2006, which was named GSR 2005.
Abstract: The laboratories that participated in the proficiency tests GSR2005 and GSR2003, which were intentionally designed the same, show a noticeable improvement in the performance of the GSR2005 test. In contrast to this, laboratories that participated in the GSR2005 test for the first time, and which can be considered a "control group," show a lower detection capability rate. This suggests that a continuous participation in the proficiency test program leads to an improvement in the performance of the individual SEM/EDX systems, particularly for the detection of submicron GSR particles. This allows the laboratories to react to weaknesses in the performance of their systems based on the individual detection capabilities. This provides the opportunity for system optimization and validation, especially as the test sample remains with the laboratories after the test for further use. Seventy-five laboratories from 28 countries participated in the proficiency test and submitted 83 independent datasets. The participating laboratories were requested to determine the total number of PbSbBa-containing particles on a synthetic test sample following their own laboratory methods of automated GSR particle search and detection by SEM/EDX. Size and position of the detected particles had to be reported by the laboratories and were evaluated statistically. The results were compiled by means of z-score according to authorized guidelines. 2 tables, 4 figures, and 10 references
Main Term(s): Criminology
Index Term(s): Crime laboratories; Crime laboratory equipment; Evidence identification; Gunshot residue; Investigative techniques
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