Prevalence of organic gunshot residues in police vehicles

Détails

ID Serval
serval:BIB_B4BF705CF0B9
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Prevalence of organic gunshot residues in police vehicles
Périodique
Science & Justice
Auteur(s)
Gassner Anne-Laure, Weyermann Céline
ISSN
1355-0306
Statut éditorial
Publié
Date de publication
10/2019
Peer-reviewed
Oui
Volume
on-line
Langue
anglais
Résumé
The present study investigated the organic gunshot residue (OGSR) background level of police vehicles in Switzerland. Specimens from 64 vehicles belonging to two regional police services were collected and analysed by LC-MS in positive mode. The driver’s and back seats were sampled separately to monitor potential differences between locations and to assess the risks of a suspect being contaminated by OGSR during transportation to a police station.
The results showed that most of the 64 vehicles were uncontaminated (44 driver’s seats and 38 back seats respectively). Up to six of the seven targeted compounds were detected in a single sample, once on a driver’s seat and twice on back seats. The contamination frequency generally decreased as the number of compounds detected together increased. The amounts detected were in the low ng range and less than amounts generally detected just after discharge on a shooter. Our data indicated that detecting a combination of four or more compounds on a police vehicle seat appears to be a relatively rare occurrence. The background contamination observed was most probably due to secondary transfer from police officers (e.g. through recent participation in a shooting session or firearm manipulation) or from firearms stored in the vehicles. The present results might be used as a recommendation to minimize contact of a suspect with contaminated surfaces if OGSR is implemented in routine work in parallel to IGSR analysis.
Mots-clé
Forensic science, firearm discharge residue, background contamination, LC-MS
Financement(s)
Autre / Swiss National Science Foundation
Création de la notice
25/10/2019 11:41
Dernière modification de la notice
09/11/2019 6:09
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