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Chromatographic Fingerprinting by Template Matching for Data Collected by Comprehensive Two-Dimensional Gas Chromatography
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Fired bullet signature correlation using the Congruent Matching Profile Segments (CMPS) method.

Zhe Chen1, Wei Chu2, Johannes A Soons2

  • 1School of Mechatronics Engineering, Harbin Institute of Technology (HIT), Harbin, 150001, China; Physical Measurement Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA.

Forensic Science International
|October 21, 2019
PubMed
Summary

A new Congruent Matching Profile Segments (CMPS) method objectively compares striated tool marks, improving accuracy for bullet signature analysis. This novel approach enhances forensic ballistics by segmenting profiles for more reliable comparisons.

Keywords:
CMPSCongruent matchingFirearm identificationForensic scienceProfile segmentTool mark

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Area of Science:

  • Forensic Science
  • Ballistics
  • Pattern Evidence Analysis

Background:

  • Objective comparison of striated tool marks is crucial in forensic ballistics.
  • Existing methods face challenges with varying scales and poor similarity in striae profiles.
  • The congruent matching cell (CMC) method was previously developed for impressed tool marks.

Purpose of the Study:

  • Introduce the Congruent Matching Profile Segments (CMPS) method for objective comparison of striated tool marks.
  • Enhance the accuracy of bullet signature correlations.
  • Address limitations of whole-profile correlation methods.

Main Methods:

  • The CMPS method segments one profile and correlates each segment with the other profile.
  • Utilizes normalized cross-correlation with multiple peak inspection.
  • Applied to land engraved areas (LEAs) of bullets fired from consecutively manufactured barrels.

Main Results:

  • Demonstrated clear separation between CMPS scores for known non-matching (KNM) and known matching (KM) LEA profiles.
  • Achieved improved comparison accuracy compared to whole-profile correlation coefficient scores.
  • Tested on 35 bullets from 10 pistol barrels, analyzing 549 KNM and 46 KM profiles.

Conclusions:

  • The CMPS method provides an objective and accurate approach for striated tool mark comparison.
  • Offers potential for statistical error rate estimations due to numerous segment correlations.
  • Represents a significant advancement in forensic tool mark analysis and bullet identification.