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A part-declared blind testing program in firearms examination.

W Kerkhoff1, R D Stoel1, E J A T Mattijssen2

  • 1Netherlands Forensic Institute, PO Box 24044, 2490 AA The Hague, The Netherlands.

Science & Justice : Journal of the Forensic Science Society
|June 14, 2018
PubMed
Summary
This summary is machine-generated.

Forensic firearm analysis by the Dutch National Police demonstrated high accuracy. Cartridge case comparisons under real casework conditions yielded no misleading evidence, with all conclusions aligning with ground truth.

Keywords:
Blind testingBullet and cartridge case comparisonFake casesPart declared testingProficiency test

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Area of Science:

  • Forensic Science
  • Ballistics
  • Firearm Examination

Background:

  • The Central Unit of the Dutch National Police conducted cartridge case comparison tests.
  • These tests were performed under real casework conditions between 2015 and 2016.
  • The Netherlands Forensic Institute (NFI) and the University of Twente (UT) supervised the study.

Purpose of the Study:

  • To evaluate the accuracy and reliability of firearm forensic analysis.
  • To assess the outcomes of cartridge case comparisons conducted under operational conditions.

Main Methods:

  • 21 cartridge case comparison tests were submitted as real cases.
  • A total of 53 conclusions were drawn from these tests.
  • Ground truth was established for each conclusion, indicating whether cases were fired from the same or different firearms.

Main Results:

  • 31 conclusions had a 'positive' ground truth (cases from the same firearm).
  • 22 conclusions had a 'negative' ground truth (cases from different firearms).
  • No misleading evidence was reported in any of the 53 conclusions.

Conclusions:

  • All conclusions drawn from the cartridge case comparisons supported the ground truth.
  • The study indicates high reliability in forensic firearm examination under real casework conditions.