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What does method validation look like for forensic voice comparison by a human expert?

Christin Kirchhübel1, Georgina Brown2, Paul Foulkes3

  • 1Soundscape Voice Evidence, Lancaster, UK.

Science & Justice : Journal of the Forensic Science Society
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Method validation is crucial in forensic speech science. This study proposes a bespoke approach for the Auditory Phonetic and Acoustic (AuPhA) method in voice comparison, considering sole practitioners.

Keywords:
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Area of Science:

  • Forensic Speech Science
  • Phonetics
  • Acoustic Analysis

Background:

  • Method validation is increasingly important in forensic speech science.
  • Existing regulatory guidance for method validation is not always suitable for all forensic analysis methods.
  • The Auditory Phonetic and Acoustic (AuPhA) approach to voice comparison requires a specific validation strategy.

Purpose of the Study:

  • To address the challenges of method validation for the AuPhA approach in forensic voice comparison.
  • To explore a bespoke method validation strategy tailored to the AuPhA method.
  • To consider the practical constraints faced by sole practitioners in forensic speech science.

Main Methods:

  • Review of current discussions on method validation in forensic speech science.
  • Development of a bespoke validation framework for the AuPhA method.
  • Illustration of a practical solution for validating human expert voice comparison using AuPhA.

Main Results:

  • A bespoke approach to method validation is necessary for the AuPhA method in forensic voice comparison.
  • General regulatory guidance may not be directly applicable to specialized forensic analysis methods.
  • A potential solution for validating AuPhA-based voice comparison by human experts is presented.

Conclusions:

  • The AuPhA method requires a tailored validation approach within forensic speech science.
  • The constraints of sole practitioners must be acknowledged in method validation.
  • This work provides a pathway for demonstrating the validity of AuPhA in forensic voice comparison.