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The Bullet Black Box Working Group (BulletBB-WG) was convened to review the results of the NIST-Noblis Bullet Black Box Study, and assess the implications of that study on casework. This report includes the recommendations of the BulletBB-WG on how to
R. Austin Hicklin, Connie Parks, Kensley Dunagan, Brandi Emerick, Nicole Richetelli, William Chapman, Melissa Taylor, Robert Thompson
Few studies have been conducted assessing the accuracy and reproducibility of bullet comparison decisions by firearms examiners, and no previous studies have evaluated accuracy of examiners' decisions when comparing 1) damaged bullets, 2) comparisons of
Martin Baiker-Sorensen, Ivo Alberink, Laura Granell, Leen van der Ham, Erwin J.A.T. Mattijssen, Erich Smith, Johannes A. Soons, Peter Vergeer, Xiaoyu Alan Zheng
In this article an automated approach for interpretation of firearm mark comparison results is presented. First, similarity scores are derived for marks typically encountered on primers of fired cartridge cases: aperture shear striations as well as
Nicholas Scurich, Brandon Garrett, Robert M. Thompson
The comparison of discharged bullets and shell casings by firearm examiners is one of the most conducted forensic analyses. However, little is known empirically about how practicing firearm examiners view and conduct their work, the range of conclusions
Michael Stocker, Theodore V. Vorburger, Thomas Renegar, Robert Thompson, Mark Williford
In recent years, more forensic laboratories are seeking accreditation to ISO 17020 and 17025. In the field of firearm and toolmark forensics, the barrel length and overall length of a firearm are typical measurements performed in the laboratory to
Michael Stocker, Johannes Soons, Thomas Renegar, Xiaoyu Zheng, Robert Thompson
Forensic laboratories considering optical 3D surface topography measurement for objective comparison and VCM face challenges with respect to cost, training, and quality assurance. The primary aim of this research was to address quality assurance issues
Erwin J. Mattijssen, Cilia Witteman, Charles Berger, Xiaoyu Alan Zheng, Johannes A. Soons, Reinoud Stoel
Forensic firearm examination provides the court of law with information about the source of fired cartridge cases. We assessed the validity of source decisions of a computer-based method and of 73 firearm examiners who compared breechface and firing pin
Jun-Feng Song, Zhe Chen, Theodore V. Vorburger, Johannes A. Soons
Firearm evidence identification has been challenged by the 2008 and 2009 National Research Council (NRC) reports and by legal proceedings on its fundamental assumptions and its procedure involving subjective decisions without a statistical foundation for
Fractography is a powerful but underutilized tool for the analysis of fractured glasses and ceramics, for fractures in the laboratory and for component failures in service. Fractography can identify the cause of failure and can even provide quantitative
Nicholas Ritchie, J Matney Wyatt, Doug DeGaetano, Ludwig Niewoehner, Frank Platek, David Edwards
The reliability of forensic inorganic gunshot residue (iGSR) analysis depends strongly on the performance of the scanning electron microscope with energy dispersive X-ray spectrometer (SEM- EDX) instrument and the software that automates the data
Xiaoyu Alan Zheng, Johannes A. Soons, Robert M. Thompson, Sushama P. Singh, Cerasela Constantin
In 2009, a report by the National Academies called into question, amongst other issues, the objectivity of visual toolmark identification by firearms examiners. The National Academies recommended development of objective toolmark identification criteria
Zhe Chen, Jun-Feng Song, Johannes A. Soons, Robert M. Thompson, Xuezeng Zhao
Most studies on bullet identification address test fire bullet that have near pristine striation 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
Zhe Chen, Wei Chu, Johannes A. Soons, Robert M. Thompson, Jun-Feng Song, Xuezeng Zhao
We introduce the Congruent Matching Profile Segments (CMPS) method for objective comparison of striated tool marks and apply it to fired bullet signature correlations. This method is derived in part from the congruent matching cell (CMC) method developed
The congruent matching cells (CMC) method was invented at the National Institute of Standards and Technology (NIST) for firearm evidence identification and error rate estimation. The CMC method divides the correlated image pairs into cells and uses four
Michael T. Stocker, Robert M. Thompson, Johannes A. Soons, Thomas B. Renegar, Xiaoyu A. Zheng
The emerging capability for measuring and analyzing the three-dimensional (3D) surface topography of forensic samples is expected to have a profound impact on firearm and toolmark identification. As forensic laboratories are working to integrate 3D
Zhe Chen, Jun-Feng Song, Wei Chu, Johannes A. Soons, Xuezeng Zhao
The Congruent Matching Cells (CMC) method was invented at the National Institute of Standards and Technology (NIST) for accurate firearm evidence identification and error rate estimation. The CMC method is based on the principle of discretization. The
John Howarter, Ming Liu, Walter G. McDonough, Christopher Soles, Gale A. Holmes
It is understood that the ballistic resistance of aromatic polyamide fibers is related to the fiber's ultimate tensile strength, strain-to-failure, and Young's modulus. Ideal high-performance ballistic materials maximize these properties while minimizing
Xiaoyu Alan Zheng, Johannes A. Soons, Robert M. Thompson
The NIST Ballistics Toolmark Research Database (NBTRD) is an open-access research database of bullet and cartridge case toolmark data. The development of the database is sponsored by the U.S. Department of Justice's National Institute of Justice. The
Don Jenket II, Amanda L. Forster, Nicholas G. Paulter Jr., Tusit Weerasooriya, Carey A. Gunnarsson, Mohamad Al-Sheikhly
During a ballistic impact, Ultra High Molecular Weight Polyethylene (UHMWPE) fibers are subjected to high temperatures and high strain-rates. Their tensile strength increases with increasing strain-rate and decreases with increasing temperature. To
Theodore V. Vorburger, Jun-Feng Song, Nicholas D. Petraco
The application of surface topography measurement methods to the field of firearm and toolmark analysis is fairly new. The field has been boosted by the development of a number of competing optical methods which has improved the speed and accuracy of
D Ott, Hao H. Zhang, Daniel B. Ott, Xuezeng Zhao, Jun-Feng Song
The spline filter is a standard linear profile filter recommended by ISO/TS 16610-22 (2006). The primary advantage of the spline filter is that no end-effects occur as a result of the filter. The ISO standard also provides the tension parameter β=0.62524
Hao H. Zhang, Daniel B. Ott, Jun-Feng Song, D Ott, Wei Chu
The spline filters and the corresponding robust filters are commonly used filters recommended in ISO standards for surface evaluation. Generally, these linear and non-linear spline filters, composed of symmetric, positive-definite matrices, are always
The Congruent Matching Cells (CMC) method was invented at the National Institute of Standards and Technology (NIST) for firearm evidence identifications. The CMC method divides the entire image into small correlation cells and uses three sets of four
Walter G. McDonough, Amanda L. Forster, Jae Hyun Kim, Nathanael A. Heckert, Joy P. Dunkers, Scott A. Wight, Gale A. Holmes
The goal of this paper and presentation is to give an update of the research effort to date being conducted at the National Institute of Standards and Technology (NIST) on polymeric fibers used in soft body armor with a special emphasis on new fibers under