Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Lead isotope ratios for bullets, forensic evaluation in a Bayesian paradigm
AU - Sjåstad, Knut-Endre
AU - Lucy, David James
AU - Andersen, Tom
PY - 2016/1/1
Y1 - 2016/1/1
N2 - Forensic science is a discipline concerned with collection, examination and evaluation of physical evidence related to criminal cases. The results from the activities of the forensic scientist may ultimately be presented to the court in such a way that the triers of fact understand the implications of the data. Forensic science has been, and still is, driven by development of new technology, and in the last two decades evaluation of evidence based on logical reasoning and Bayesian statistic has reached some level of general acceptance within the forensic community.Tracing of lead fragments of unknown origin to a given source of ammunition is a task that might be of interest for the Court. Use of data from lead isotope ratios analysis interpreted within a Bayesian framework has shown to be suitable method to guide the Court to draw their conclusion for such task.In this work we have used isotopic composition of lead from small arms projectiles (cal. .22) and developed an approach based on Bayesian statistics and likelihood ratio calculation. The likelihood ratio is a single quantity that provides a measure of the value of evidence that can be used in the deliberation of the court.
AB - Forensic science is a discipline concerned with collection, examination and evaluation of physical evidence related to criminal cases. The results from the activities of the forensic scientist may ultimately be presented to the court in such a way that the triers of fact understand the implications of the data. Forensic science has been, and still is, driven by development of new technology, and in the last two decades evaluation of evidence based on logical reasoning and Bayesian statistic has reached some level of general acceptance within the forensic community.Tracing of lead fragments of unknown origin to a given source of ammunition is a task that might be of interest for the Court. Use of data from lead isotope ratios analysis interpreted within a Bayesian framework has shown to be suitable method to guide the Court to draw their conclusion for such task.In this work we have used isotopic composition of lead from small arms projectiles (cal. .22) and developed an approach based on Bayesian statistics and likelihood ratio calculation. The likelihood ratio is a single quantity that provides a measure of the value of evidence that can be used in the deliberation of the court.
KW - Bullets
KW - Ammunition
KW - Lead isotope ratios
KW - Lead isotopic composition (LIC)
KW - Multicollector inductive coupled plasma mass spectrometry (MC-ICP-MS)
KW - Forensic evaluation
KW - Interpretation
KW - Likelihood ratio
KW - LR
KW - Bayesian statistics
KW - Descriptive statistics
U2 - 10.1016/j.talanta.2015.07.070
DO - 10.1016/j.talanta.2015.07.070
M3 - Journal article
VL - 146
SP - 62
EP - 70
JO - Talanta
JF - Talanta
SN - 0039-9140
ER -