by Lawrence Rice, CMECI Consultant / Retired Law Enforcement Voice Stress Examiner / Instructor   November 9, 2025   As law enforcement, security professionals, and investigators continue to rely on voice stress analysis tools to detect deception and emotional stress, it is time to ask whether the tools truly reflect modern science and technology. Many of today’s systems, often referred to as a Computer Voice Stress Analyzer (CVSA), are rooted in technology that dates back de

by Lawrence Rice, CMECI Consultant / Retired Law Enforcement Voice Stress Examiner / Instructor   October 24, 2025   For decades, scientists and investigators have sought reliable ways to evaluate stress and credibility through the human voice. Two dominant perspectives have guided this search: the vocal micro-tremor theory (VMT) and the vagal mediation model of stress. While early voice stress analyzers such as the Conventional Voice Stress Analyzer (CVSA) were based on the

by Lawrence Rice Consultant / Retired Law Enforcement Voice Stress Examiner / Instructor   September 16, 2025   Executive Summary     Voice stress analysis (VSA), including what is now recognized as Conventional Voice Stress Analysis (CVSA), has historically struggled to gain widespread scientific support, primarily due to inflated claims that it could detect deception directly. This framing has weakened credibility and placed VSA in the same category as controversial “lie de