Population Statistics for Firearm Toolmark Analysis

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NCJ Number
311172
Author(s)
XIAOYU ALAN ZHENG
JOHANNES SOONS
Date Published
June 2022
Length
31 pages
Abstract

This document contains slides of a presentation given by Xiaoyu Alan Zheng at the 2022 Association of Firearms and Tool Mark Examiners (AFTE) Annual Training Seminar in Atlanta, GA. Preliminary results are presented of a project in which the similarities of 3D images of known matching and known non-matching fired cartridge cases are compared across a range of firearm models and ammunition types. The variation of the resulting Score-based Likelihood Ratio is demonstrated, showing the importance of large reference populations for building appropriately relevant sub-populations.

Grant Number(s)
2016-DNR-6257-3
Agencies
NIJ-Sponsored
Publication Type
Presentation
Research (Applied/Empirical)
Award
Development of Nationwide Reference Population Distributions for Statistically Supported and Objective Testimony in Firearm Evidence Comparisons
Date Published: June 1, 2022

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