U.S. flag

An official website of the United States government, Department of Justice.

Pattern evidence

Just a Curious Case of Print Persistence

September 2022

In episode two of our Applications of Forensic Science for Human Identification Season, Just Science sat down with Bryan Johnson, the Major Incident Program Manager in the Federal Bureau of Investigation's Latent Print Unit, to discuss how postmortem prints can be used to help identify unknown decedents. One of the cheapest, easiest and fastest methods of identifying individuals is through friction ridge prints. However, challenges can arise in cases where trauma or decomposition affect quality of a decedent's hands.

Just Footwear Impressions on Fabric

November 2023

In Episode eight of our case study season, Just Science sat down with Brian McVicker, a forensic footwear and tire examiner at the Federal Bureau of Investigation, to discuss developing shoe and tire impressions on fabric using ninhydrin. When a victim is stomped or run over the transfer of skin cells onto the inside of the victim's clothing can leave an impression of the shoe or tire that was used.

Just a Curious Case of Print Persistence

August 2022

In episode one of our Case Studies Part 1 mini season, Just Science sat down with Michael Fagert, a certified latent print examiner at the Kansas Bureau of Investigation, to discuss a latent print phenomenon that is not often seen in casework. There are very few instances of identifiable fingerprints on cartridge cases recovered from crime scenes, as the firing process introduces adverse physical and thermal stressors to fingerprint residues.

Impression, Pattern & Trace Evidence Research and Development: 2022 NIJ Forensic R&D Symposium

March 2022

The NIJ Forensic Science Research and Development Symposium is an open meeting where attendees can learn about NIJ-funded research across a variety of forensic science areas. This is one of four videos from the 2022 symposium, which was held March 1-2, 2022.

Presentations include -

2022 NIJ Forensic Science Research and Development Symposium

The NIJ Forensic Science Research and Development Symposium is an open meeting where attendees can learn about NIJ-funded research across a variety of forensic science areas. The 2024 symposium was was held March 1-2, 2022.

NIJ and its Forensic Technology Center of Excellence are committed to improving the practice of forensic science and strengthening its impact by supporting research and development, rigorous technology evaluation and...

Casework Efficiency, LIMS Integration, and Workflow Configurations for 3D Firearm Imaging

September 2024

This video is one of four from the Virtual Workshop Series: 3D Firearm Imaging, hosted by the NIJ Forensic Technology Center of Excellence from August 21 to September 11, 2024. 

Throughout this workshop series, attendees hear from a range of presenters and subject matter experts.  

This video includes the presentation Integrating Cadre Forensic TopMatch-3D in NIBIN Workflows, Alexander Luby, Firearms Examiner at Unified Forensic Laboratory.

Validation Standards and Technical Working Group for 3D Toolmark Technologies

August 2024

This video is one of four from the Virtual Workshop Series: 3D Firearm Imaging, hosted by the NIJ Forensic Technology Center of Excellence from August 21 to September 11, 2024. Throughout this workshop series, attendees hear from a range of presenters and subject matter experts.  

This video includes a presentations by Todd Weller, Weller Forensics, and Rachael Gominsky, Federal Bureau of Investigation Session.

Introduction to 3D Firearm Microscopy, Instrumentation, and Measurement Practices

August 2024

This video is one of four from the Virtual Workshop Series: 3D Firearm Imaging, hosted by the NIJ Forensic Technology Center of Excellence from August 21 to September 11, 2024. Throughout this workshop series, attendees hear from a range of presenters and subject matter experts.  

This video includes the presentation" Instrumentation, and Measurement Practices," Xiaoyu Alan Zheng, National Institute of Standards and Technology, and Rachael Gominsky, Federal Bureau of Investigation.

3D Firearm Imaging: Testimony and Admissibility

September 2024

This video is one of four from the Virtual Workshop Series: 3D Firearm Imaging, hosted by the NIJ Forensic Technology Center of Excellence from August 21 to September 11, 2024. This series is intended for firearm examiners or soon-to-be firearm examiners working in laboratories that have recently adopted 3D Firearm Imaging or are considering its adoption soon.

This video includes two presentations - 

Virtual Workshop Series: 3D Firearm Imaging

The National Institute of Justice (NIJ) and the Forensic Technology Center of Excellence delivered a four-session Virtual Workshop Series: 3D Firearm Imaging from August 21 to September 11, 2024. This series is intended for firearm examiners or soon-to-be firearm examiners working in laboratories that have recently adopted 3D Firearm Imaging or are considering its adoption soon.

Watch the recorded sessions - 

Impression, Pattern & Trace Evidence Research & Development: Presentations at the 2024 R&D Symposium

September 2024

The NIJ Forensic Science Research and Development Symposium is an open meeting where attendees can learn about NIJ-funded research across a variety of forensic science areas. This is one of five videos from the 2024 symposium, which was held September 19, 2024.

The Accuracy, Repeatability, and Reproducibility of Firearms/Toolmarks Comparisons

January 2022

This video is one of 12 from the recorded at the Firearm and Toolmarks Policy and Practice Forum hosted by the NIJ Forensic Technology Center of Excellence January 11–14, 2022. Video includes welcome remarks and a keynote address by Erich Smith, FBI Laboratory. The symposium included presentations and panel discussions on topics relevant to recent advances in firearm and toolmark examination with a focus on the future. 

NIJ's Forensic Intelligence Initiative - Using Forensics for Crime Disruption and Prevention

January 2022

This video, a presentation by NIJ's Jonathan McGrath and Basia Lopez, is one of 12 from the recorded at the Firearm and Toolmarks Policy and Practice Forum hosted by the NIJ Forensic Technology Center of Excellence January 11–14, 2022. The symposium included presentations and panel discussions on topics relevant to recent advances in firearm and toolmark examination with a focus on the future. 

Crime Gun Intelligence Revolution: Day 3 Keynote at the Firearm & Toolmarks Policy & Practice Forum

January 2022

This video is one of 12 from the recorded at the Firearm and Toolmarks Policy and Practice Forum hosted by the NIJ Forensic Technology Center of Excellence January 11–14, 2022. This video includes welcoming remarks and the day keynote address by Thomas Chittum, Bureau of Alcohol, Tobacco, Firearms, and Explosives. The symposium included presentations and panel discussions on topics relevant to recent advances in firearm and toolmark examination with a focus on the future. 

Impact of Advances in Computer Science, Statistics & Engineering on Firearms & Toolmarks Examination

January 2025

This video is one of 12 from the recorded at the Firearm and Toolmarks Policy and Practice Forum hosted by the NIJ Forensic Technology Center of Excellence January 11–14, 2022. This video includes a brief introduction and the keynote from day 2, which focused on emerging technologies. 

Support for Firearms and Toolmarks R&D at the National Institute of Justice

January 2022

This video, a presentation by Gregory Dutton, Ph.D., is one of 12 from the recorded at the Firearm and Toolmarks Policy and Practice Forum hosted by the NIJ Forensic Technology Center of Excellence January 11–14, 2022. The symposium included presentations and panel discussions on topics relevant to recent advances in firearm and toolmark examination with a focus on the future.