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Tuesday, May 7, 2013

Owen Forensic Services, LLC offers one of the most
sophisticated digital audio and video processing
laboratories presently available. With 35 years
of experience, Thomas J. Owen, an internationally
known forensic expert is the Chairman-Emeritus of the
American Board of Recorded Evidence.


I - Introduction

  The forensic science of voice identification has come a long way from when it was first introduced in the American courts back in the mid 1960's. In the early days of this identification technique there was little research to support the theory that human voices are unique and could be used as a means for identification. There was also no standardization of how an identification was reached, or even training or qualifications necessary to perform the analysis. Voice comparisons were made solely on the pattern analysis of a few commonly used words. Due to the newness of the technique there were only a few people in the world who performed voice identification analysis and were capable of explaining it to a court. Gradually the process became known to other scientists who voiced concerns, not as to the validity of the analysis, but as to the lack of substantial research demonstrating the reliability of the technique. They felt that the technique should not be used in the courtroom without more documentation. Thus the battle lines were drawn over the admissibility of voice identification evidence with proponents claiming a valid, reliable identification process and opponents claiming more research must be completed before the process should be used in courtrooms.

Today voice identification analysis has matured into a sophisticated identification technique, using the latest technology science has to offer. The research, which is still continuing today, demonstrates the validity and reliability of the process when performed by a trained and certified examiner using established, standardized procedures. Voice identification experts are found all over the world. No longer limited to the visual comparison of a few words, the comparison of human voices now focuses on every aspect of the words spoken; the words themselves, the way the words flow together, and the pauses between them. Both aural and spectrographic analysis are combined to form the conclusion about the identity of the voices in question.

The road to admissibility of voice identification evidence in the courts of the United States has not been without its potholes. Many courts have had to rule on this issue without having access to all the facts. Trial strategies and budgets have resulted in incomplete pictures for the courts. To compound the problem, courts have utilized different standards of admission resulting in different opinions as to the admissibility of voice identification evidence. Even those courts which have claimed to use the same standard of admissibility have interpreted it in a variety of ways resulting in a lack of consistency. Although many courts have denied admission to voice identification evidence, none of the courts excluding the spectrographic evidence have found the technique unreliable. Exclusion has always been based on the fact that the evidence presented did not present a clear picture of the technique's acceptance in the scientific community and as such, the court was reluctant to rely on that evidence. The majority of courts hearing the issue have admitted spectrographic voice identification evidence.



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