Assessing the admissibility of a new generation of forensic voice comparison testimony


This article provides a primer on forensic voice comparison (aka forensic speaker recognition), a branch of forensic science in which the forensic practitioner analyzes a voice recording in order to provide an expert opinion that will help the trier-of-fact determine the identity of the speaker. The article begins with an explanation of ways in which human speech varies within and between speakers. It then discusses different technical approaches that forensic practitioners have used to compare voice recordings, and frameworks of reasoning that practitioners have used for evaluating the evidence and reporting its strength. It then discusses procedures for empirical validation of the performance of forensic voice comparison systems. It also discusses the potential influence of contextual bias and ways to reduce this. Building on this scientific foundation, the article then offers analysis, commentary, and recommendations on how courts evaluate the admissibility of forensic voice comparison testimony under the Daubert and Frye standards. It reviews past rulings such as U.S. v. Angleton, 269 F.Supp 2nd 892 (S.D. Tex. 2003) that found expert testimony based on the spectrographic approach inadmissible under Daubert. The article also offers a detailed analysis of the evidence presented in the recent Daubert hearing in U.S. v. Ahmed, et al. 2015 EDNY 12-CR-661, which included testimony based on the newer automatic approach. The scientific testimony proffered in Ahmed is used to illustrate the issues courts are likely to face when considering the admissibility of forensic voice comparison testimony in the future. The article concludes with a discussion of how proponents of forensic voice comparison testimony might meet a reasonably rigorous application of the Daubert standard and thereby ensure that such testimony is sufficiently trustworthy to be used in court.

Divisions: College of Business and Social Sciences > Aston Institute for Forensic Linguistics
College of Business and Social Sciences > School of Social Sciences & Humanities
Additional Information: Copyright: The authors, 2017. This work is made available under the Creative Commons Attribution—Non-Commercial—No Derivative Works 3.0 License. This article is published in a prestigious US law journal which is reviewed by the editors, not externally peer reviewed. This is the norm for US law review journals. Funding: Simons Foundation, EPSRC Grant Number EP/K032208/1, National Institute of Justice Award 2014-DN-BX.
Publication ISSN: 2161-9271
Full Text Link: http://www.stlr ... sonThompson.pdf
Related URLs: ... viii-2016-2017/ (Publisher URL)
PURE Output Type: Article
Published Date: 2017-05-15
Published Online Date: 2017-05-15
Accepted Date: 2017-05-04
Authors: Morrison, Geoffrey Stewart (ORCID Profile 0000-0001-8608-8207)
Thompson, William C.

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