Assessing the evidentiary value of smokeless powder comparisons

Forensic Science International : Synergy
Dana-Marie K DennisMichael E Sigman

Abstract

Gas chromatography-electron ionization-mass spectrometry (GC-EI-MS) and physical characteristics data for 726 smokeless reloading powders were analyzed by pairwise comparisons of samples comprising the same product and different products. Pairwise comparisons were restricted to samples having matching kernel shape, color, presence or absence of a perforation and measurements. Discrete results were analyzed for same and different products having matching chemical composition determined from a list of 13 organic components. A continuous score-based likelihood ratio was determined for same and different product comparisons using the Fisher transform of the Pearson correlation between the total ion spectra of the compared samples. Probability distributions for same product and different product comparisons appeared bimodal and were modeled with kernel density distributions. In the discrete and continuous data comparisons, the likelihood ratios for probabilities conditioned on same shape, color, presence/absence of perforation and size were found to provide relatively limited support for either the proposition of same product or different product. Further restricting the pairwise comparisons to samples belonging to the same cluster,...Continue Reading

References

May 5, 2000·Science & Justice : Journal of the Forensic Science Society·I W EvettJ A Lambert
Nov 30, 2000·Science & Justice : Journal of the Forensic Science Society·I W EvettS McCrossan
Jul 27, 2001·Bioinformatics·Z Bar-JosephT S Jaakkola
Feb 16, 2006·Journal of the National Cancer Institute·Christos SotiriouMauro Delorenzi
Feb 9, 2007·Nature Biotechnology·Michael J KeiserBrian K Shoichet
Jan 31, 2008·RNA·Mads BakSakari Kauppinen
Feb 27, 2009·Analytical and Bioanalytical Chemistry·Gwynyth ScherperelRuth Waddell Smith
Nov 27, 2010·Forensic Science International : Synergy·Monica JoshiJose R Almirall
Feb 7, 2012·Analytica Chimica Acta·María López-LópezCarmen García-Ruiz
Aug 18, 2012·Journal of Chromatography. a·Chloé de PerreBruce R McCord
May 15, 2013·Forensic Science International : Synergy·Daniel Ramos, Joaquin Gonzalez-Rodriguez

❮ Previous
Next ❯

Citations

Feb 15, 2019·Journal of the American Society for Mass Spectrometry·Ramón González-Méndez, Chris A Mayhew
Jan 2, 2021·Forensic Science International : Synergy·Sébastien CharlesBart Nys
Jan 2, 2021·Forensic Science International : Synergy·Douglas J KlapecJulie Pannuto
Mar 31, 2019·Journal of the American Society for Mass Spectrometry·Candice Bridge, Mark Marić
Sep 3, 2020·Journal of the American Society for Mass Spectrometry·Callum BonnarK Paul Kirkbride

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.