The impact of chemical trace evidence on justice outcomes

Exploring the additive value of forensic science disciplines

Peter A. Woodman, Caroline Spiranovic, Roberta Julian, Kaye N. Ballantyne, Sally F. Kelty

Research output: Contribution to journalArticle

Abstract

The focus of this research was to examine the contribution chemical trace evidence makes to criminal justice outcomes. The aim of this work was to place the discipline of chemical trace evidence under the spotlight as there is a dearth of robust research on the impact of this discipline. In this study, data relating to the forensic examinations in a sample of 238 cases which included chemical trace evidence, was collated with data from police investigations and court processes. The findings show that chemical trace evidence is frequently used in combination with other forensic disciplines to support the progress of high-level criminal cases through the justice system. Due to characteristics of how the criminal cases in the dataset were investigated and prosecuted, in combination with the methodology applied in this study, the impact of forensic evidence on the decision to charge suspects could not be analysed quantitatively. However, the impact of forensic evidence on court outcomes in the sample of cases was analysed using methodology that considered the results of the examinations, and the ability of the evidence to provide support for the inclusion or exclusion of persons of interest. The possibility of chemical trace evidence having impact when applied in combination with other forensic disciplines was also examined. It was found that biological examination results was a significant standalone predictor of court outcomes. In contrast, chemical trace examinations did not predict court outcomes when considered as a standalone predictor but examination results of chemical trace evidence in combination with ballistics/tool marks was significantly associated with court outcomes. The findings of this research indicate that, to assess the full impact of any discipline of forensic evidence on the criminal justice system, the analysis must take into account the potential for important synergies that may exist with other forensic and non-forensic evidence.

Original languageEnglish
Article number110121
Pages (from-to)1-12
Number of pages12
JournalForensic Science International
Volume307
DOIs
Publication statusPublished - 1 Feb 2020
Externally publishedYes

Fingerprint

Forensic Sciences
Social Justice
Criminal Law
Research
Police
Systems Analysis

Cite this

Woodman, Peter A. ; Spiranovic, Caroline ; Julian, Roberta ; Ballantyne, Kaye N. ; Kelty, Sally F. / The impact of chemical trace evidence on justice outcomes : Exploring the additive value of forensic science disciplines. In: Forensic Science International. 2020 ; Vol. 307. pp. 1-12.
@article{90ffebfb793b444e9f0460238d2f2074,
title = "The impact of chemical trace evidence on justice outcomes: Exploring the additive value of forensic science disciplines",
abstract = "The focus of this research was to examine the contribution chemical trace evidence makes to criminal justice outcomes. The aim of this work was to place the discipline of chemical trace evidence under the spotlight as there is a dearth of robust research on the impact of this discipline. In this study, data relating to the forensic examinations in a sample of 238 cases which included chemical trace evidence, was collated with data from police investigations and court processes. The findings show that chemical trace evidence is frequently used in combination with other forensic disciplines to support the progress of high-level criminal cases through the justice system. Due to characteristics of how the criminal cases in the dataset were investigated and prosecuted, in combination with the methodology applied in this study, the impact of forensic evidence on the decision to charge suspects could not be analysed quantitatively. However, the impact of forensic evidence on court outcomes in the sample of cases was analysed using methodology that considered the results of the examinations, and the ability of the evidence to provide support for the inclusion or exclusion of persons of interest. The possibility of chemical trace evidence having impact when applied in combination with other forensic disciplines was also examined. It was found that biological examination results was a significant standalone predictor of court outcomes. In contrast, chemical trace examinations did not predict court outcomes when considered as a standalone predictor but examination results of chemical trace evidence in combination with ballistics/tool marks was significantly associated with court outcomes. The findings of this research indicate that, to assess the full impact of any discipline of forensic evidence on the criminal justice system, the analysis must take into account the potential for important synergies that may exist with other forensic and non-forensic evidence.",
keywords = "Ballistics, Biology, Chemical trace evidence, Criminal justice outcomes, Criminal justice system, Quantitative analysis",
author = "Woodman, {Peter A.} and Caroline Spiranovic and Roberta Julian and Ballantyne, {Kaye N.} and Kelty, {Sally F.}",
year = "2020",
month = "2",
day = "1",
doi = "10.1016/j.forsciint.2019.110121",
language = "English",
volume = "307",
pages = "1--12",
journal = "Forensic Science",
issn = "0379-0738",
publisher = "Elsevier Ireland Ltd",

}

The impact of chemical trace evidence on justice outcomes : Exploring the additive value of forensic science disciplines. / Woodman, Peter A.; Spiranovic, Caroline; Julian, Roberta; Ballantyne, Kaye N.; Kelty, Sally F.

In: Forensic Science International, Vol. 307, 110121, 01.02.2020, p. 1-12.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The impact of chemical trace evidence on justice outcomes

T2 - Exploring the additive value of forensic science disciplines

AU - Woodman, Peter A.

AU - Spiranovic, Caroline

AU - Julian, Roberta

AU - Ballantyne, Kaye N.

AU - Kelty, Sally F.

PY - 2020/2/1

Y1 - 2020/2/1

N2 - The focus of this research was to examine the contribution chemical trace evidence makes to criminal justice outcomes. The aim of this work was to place the discipline of chemical trace evidence under the spotlight as there is a dearth of robust research on the impact of this discipline. In this study, data relating to the forensic examinations in a sample of 238 cases which included chemical trace evidence, was collated with data from police investigations and court processes. The findings show that chemical trace evidence is frequently used in combination with other forensic disciplines to support the progress of high-level criminal cases through the justice system. Due to characteristics of how the criminal cases in the dataset were investigated and prosecuted, in combination with the methodology applied in this study, the impact of forensic evidence on the decision to charge suspects could not be analysed quantitatively. However, the impact of forensic evidence on court outcomes in the sample of cases was analysed using methodology that considered the results of the examinations, and the ability of the evidence to provide support for the inclusion or exclusion of persons of interest. The possibility of chemical trace evidence having impact when applied in combination with other forensic disciplines was also examined. It was found that biological examination results was a significant standalone predictor of court outcomes. In contrast, chemical trace examinations did not predict court outcomes when considered as a standalone predictor but examination results of chemical trace evidence in combination with ballistics/tool marks was significantly associated with court outcomes. The findings of this research indicate that, to assess the full impact of any discipline of forensic evidence on the criminal justice system, the analysis must take into account the potential for important synergies that may exist with other forensic and non-forensic evidence.

AB - The focus of this research was to examine the contribution chemical trace evidence makes to criminal justice outcomes. The aim of this work was to place the discipline of chemical trace evidence under the spotlight as there is a dearth of robust research on the impact of this discipline. In this study, data relating to the forensic examinations in a sample of 238 cases which included chemical trace evidence, was collated with data from police investigations and court processes. The findings show that chemical trace evidence is frequently used in combination with other forensic disciplines to support the progress of high-level criminal cases through the justice system. Due to characteristics of how the criminal cases in the dataset were investigated and prosecuted, in combination with the methodology applied in this study, the impact of forensic evidence on the decision to charge suspects could not be analysed quantitatively. However, the impact of forensic evidence on court outcomes in the sample of cases was analysed using methodology that considered the results of the examinations, and the ability of the evidence to provide support for the inclusion or exclusion of persons of interest. The possibility of chemical trace evidence having impact when applied in combination with other forensic disciplines was also examined. It was found that biological examination results was a significant standalone predictor of court outcomes. In contrast, chemical trace examinations did not predict court outcomes when considered as a standalone predictor but examination results of chemical trace evidence in combination with ballistics/tool marks was significantly associated with court outcomes. The findings of this research indicate that, to assess the full impact of any discipline of forensic evidence on the criminal justice system, the analysis must take into account the potential for important synergies that may exist with other forensic and non-forensic evidence.

KW - Ballistics

KW - Biology

KW - Chemical trace evidence

KW - Criminal justice outcomes

KW - Criminal justice system

KW - Quantitative analysis

UR - http://www.scopus.com/inward/record.url?scp=85077110836&partnerID=8YFLogxK

U2 - 10.1016/j.forsciint.2019.110121

DO - 10.1016/j.forsciint.2019.110121

M3 - Article

VL - 307

SP - 1

EP - 12

JO - Forensic Science

JF - Forensic Science

SN - 0379-0738

M1 - 110121

ER -