Diagnosing Speech Disorders: Can Voice Stress Analysis be Used in the Medical Field? Although Computer Voice Stress Analysis (CVSA) is most commonly used to interview suspects and witnesses in criminal investigations, the technology’s ability to identify vocal tremors...
Blog
Scientific Study Summary: “Structured Interview Assessment of the Field Use of Voice Stress Analyzer Technology.” Department of Defense, 30 Mar. 2007.
How is Voice Stress Analysis Technology Viewed in the Law Enforcement Community? In the mid-2000’s, the Department of Defense set out to conduct a qualitative study to investigate the validity and reliability of voice stress analysis (VSA) technology in a military...
Scientific Study Summary:“Policy Review: CVSA is a Valid Law Enforcement Tool.” Hugh Wilson Ridelhuber and Patrick Flood. 2002
What are the Benefits of Voice Stress Analysis for Law Enforcement? In August 2002, Dr. Hugh Wilson Ridelhuber and Dr. Patrick Flood submitted a policy review to the Law Enforcement Executive Forum to demonstrate the validity of the Computer Voice Stress Analyzer...
Scientific Study Summary: Cistaro, Victor, Ph. D. “A Comparison Between Decision Accuracy Rates Obtained Using Polygraph and the Computer Voice Stress Analyzer in the Absence of Jeopardy.” The Department of Defense – Polygraph Institute, Aug. 1995.
How Did the Department of Defense Verify the Theory Behind Voice Stress Analysis? In 1995, a new type of truth verification technology was making its mark in the law enforcement community: the Computer Voice Stress Analyzer (CVSA®). First introduced by the National...
Scientific Study Summary: Eden, G. and Inbar, G.F. “Psychological Stress Evaluators: EMG Correlation with Voice Tremor.” Department of Electrical Engineering Technion, Israel Institute of Technology, Haifa, Israel. 1976
How Did EMG Experiments Lead to Contemporary Voice Stress Tests? Over the course of about a decade, J. Gary Eden and Gideon F. Inbar—two researchers in the Department of Electrical Engineering Technology at the Israel Institute of Technology—conducted multiple studies...
Scientific Study Summary: “The Rhythmical Activity of Groups of Motor Units in the Voluntary Contraction of Muscle.” O.C.J. Lippold, J.W. T. Redfearn, and J. Vuco. University College London 1957
What Early Scientific Studies Led to the Development of Computer Voice Stress Analysis? The scientific research behind the Computer Voice Stress Analyzer (CVSA) goes back over sixty years. One of the earliest studies, published in 1957 by O.C.J. Lippold, J.W.T....
How CVSA Truth Verification Can Disprove False Accusations of Sexual Assault
When a person calls 911 to report sexual assault, there is no time to debate whether these allegations are true. The alleged victim’s word must be taken at face value until further questioning and investigating can verify the story. But if allegations are proven...
Police Questioning of Minors: The Best Truth Verification for Juvenile Suspects
When a minor is accused of a heinous crime, it’s easy to forget that person is still a child. The police need to obtain information from the suspect, but accusatory interrogations aren’t appropriate when interviewing a minor. Instead, investigators should consider...
Comparing the CVSA and the Polygraph in the Investigation of a West Virginia Murder
There are plenty of challenges working in the mines of West Virginia, where men and women regularly risk their lives for a paycheck. In the past few decades, there have been over a hundred accidents listed on the West Virginia Office of Miners' Health Safety and...
Overcoming the Defenses of a Repeat Child Abuse Offender with the DBR Interview Technique
The death of a baby is invariably an investigation fraught with emotion, chaos, and confusion. There are natural conditions that can cause an infant to die, making it difficult to determine on-scene cause of death. For instance, some parents have been considered...