Skip to main content
U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

Xiaoyu Alan Zheng

Xiaoyu Alan Zheng is a Mechanical Engineer in Sensor Science Division of the National Institute of Standards and Technology (NIST). He has a B.S. and M.S. in Mechanical Engineering and focuses his research on objective measurements and analysis of 2D/3D firearm toolmarks. He served six years on the Subcommittee for Firearms & Toolmarks in the NIST OSACs where his contributions led to the development of three standards surrounding the implementation of 3D technologies in the forensic laboratory. He has led multiple successful National Institute of Justice grant funded projects for the development of the NIST Ballistics Toolmark Research Database (NBTRD) as well as research into population statistics for firearms. He is currently the chair of the Technical Advisor committee for the Association of Firearm and Toolmark Examiners (AFTE) and the co-chair of the Technical Working Group for 3D Toolmark Technologies (TWG3D2T). His primary focus is currently the development of the national Reference Population Database of Firearm and Toolmarks (RPDFT). This project seeks to provide forensic firearm examiners the ability to include objective similarity metrics and associated statistical statements of certainty with their court testimonies.

Publications

Firearm examination: Examiner judgments and computer-based comparisons

Author(s)
Xiaoyu A. Zheng, Erwin J. Mattijssen, Johannes A. Soons, Charles Berger, Cilia Witteman, 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

NIST Ballistics Toolmark Research Database

Author(s)
Xiaoyu A. 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

NIST Ballistics Toolmark Research Database

Author(s)
Xiaoyu A. 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

The Second National Ballistics Imaging Comparison (NBIC-2)

Author(s)
Theodore V. Vorburger, James H. Yen, Jun-Feng Song, Robert M. Thompson, Thomas B. Renegar, Xiaoyu A. Zheng, D Ott, Martin G. Ols
In response to the guidelines issued by the American Society of Crime Laboratory Directors/Laboratory Accreditation Board (ASCLD/LAB-International) to establish
Created April 7, 2019, Updated October 16, 2020