Forensic toolmark examiners have been comparing features observed in toolmarks to help determine their source for over a century. However, in the past decade, the holistic process of comparing toolmarks and presenting findings in court have faced intense scrutiny. This paper provides a summary of the voiced criticisms, primarily concerning the scientific reliability and validity of the comparison methods employed by examiners and the conclusions they testify to. The focus of this review is specifically on the examination of striated toolmarks. We assess the comparison methods and reporting practices currently in use, while also delving deeper into research aligned with current recommendations, such as PCAST (The President's Council of Advisors on Science and Technology). Throughout the review, we examine both the strengths and weaknesses of existing practices, aiming to assist practitioners in identifying key research needs and addressing the concerns raised by critics. By doing so, we seek to enhance the credibility and effectiveness of toolmark analysis in the field of forensic science.
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http://dx.doi.org/10.1016/j.forsciint.2024.111997 | DOI Listing |
Forensic Sci Int
November 2024
School of Criminal Justice, Faculty of Law, Criminal Justice and Public Administration, University of Lausanne, 1015, Switzerland. Electronic address:
Toolmarks examination validity and subjectivity have come under scrutiny. This research focuses on the case of cutting plier marks. This paper presents an automatic comparison method and assesses its performance.
View Article and Find Full Text PDFForensic Sci Int
April 2024
School of Criminal Justice, Faculty of Law, Criminal Justice and Public Administration, University of Lausanne, Lausanne 1015, Switzerland. Electronic address:
Forensic toolmark examiners have been comparing features observed in toolmarks to help determine their source for over a century. However, in the past decade, the holistic process of comparing toolmarks and presenting findings in court have faced intense scrutiny. This paper provides a summary of the voiced criticisms, primarily concerning the scientific reliability and validity of the comparison methods employed by examiners and the conclusions they testify to.
View Article and Find Full Text PDFForensic Sci Int
January 2020
School of Mechatronics Engineering, Harbin Institute of Technology (HIT), Harbin, 150001, China. Electronic address:
Most studies on bullet identification address test fired bullets that have near pristine striated marks on the land engraved areas (LEAs). However, in case work, bullets found at a crime scene may be severely deformed or fragmented. The resulting missing, expanded, or distorted LEA striations can cause challenges in toolmark comparisons performed by examiners or algorithms.
View Article and Find Full Text PDFJ Forensic Sci
May 2017
Contra Costa County Office of the Sheriff, Forensic Services Division, Martinez, CA.
The field of firearms and toolmark analysis has encountered deep scrutiny of late, stemming from a handful of voices, primarily in the law and statistical communities. While strong scrutiny is a healthy and necessary part of any scientific endeavor, much of the current criticism leveled at firearm and toolmark analysis is, at best, misinformed and, at worst, punditry. One of the most persistent criticisms stems from the view that as the field lacks quantified random match probability data (or at least a firm statistical model) with which to calculate the probability of a false match, all expert testimony concerning firearm and toolmark identification or source attribution is unreliable and should be ruled inadmissible.
View Article and Find Full Text PDFSci Justice
January 2017
UCD School of Mechanical and Materials Engineering, University College Dublin, Belfield, Dublin 4, Ireland. Electronic address:
Following a shooting incident where a vehicle is used to convey the culprits to and from the scene, both the getaway car and the firearm are often deliberately burned in an attempt to destroy any forensic evidence which may be subsequently recovered. Here we investigate the factors that influence the ability to make toolmark identifications on ammunition discharged from pistols recovered from such car fires. This work was carried out by conducting a number of controlled furnace tests in conjunction with real car fire tests in which three 9mm semi-automatic pistols were burned.
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