California Lie Detector – Lie Detection Services for California

The POWER of TRUTH

This field study of criminal suspects and persons of interest is based upon actual CVSA examinations conducted by Prof. James Chapman over an 18-year period. The study resulted in an accuracy rate of 99.69%, a precision rate of 99.67% and a verified confession rate of 96.4%.

Of The 329 Confession Possibilites

Of The Cvsa Examinations Produced A "Stress Indicated" Result

0 %

of those resulted in validated confessions

0 %

of interviews conducted, suspects made self-incriminating confessions

0 %

The Total Inventory Of Cvsa Cases Submitted

which exceeded 3,000 was culled for cases that met the following criteria:

A confession was a
potential income

There was no involvement with veracity testing of previous statements

No employment clearance was involved

The case was not used as confirmation of prior witness testimony

The facts of the case were such that responses could be verified by means of CVSA follow-up questioning

These Crimes Included, But Not Limited To:

After excluding cases that did not meet all the above criteria, the criminal cases remaining for study in which legally admissible confessions were possible totaled 2,109. A total of 236 cases, involving 329 crimes

Multiple Homicides

Corporate Theft

Organized Crime

Contract Murders

Sexual Abuse Of Children

Arson For Hire

91%

of the cases studied represented criminal investigations in which legal authorities had reached an investigative impasse. After following standard investigative procedures, investigators had been unable to reach a firm conclusion as to guild or innocence.

Each subject named in the “Confession Possibility” list was individually interviewed by the CVSA examiner, with two goals in mind:

Each Interview Was Conducted According

to a standard protocol in which the wording of the interview, but not the methodology, was adapted on-site to each specific case. In each case, the CVSA procedure used by the examiner consisted of these steps:

The CVSA examiner was briefed by the requesting authorities in order to become familiar with the circumstances of each case.

A pre-test interview with the subject was conducted.

The initial test questions were formulated and presented to the subject. Examinations contained from 9-31 questions, consisting of relevant, irrelevant, and control questions for which the subject provided "yes" or "no" answers.

The fourth step included processing the responses with the CVSA instrument, after which the resulting CVSA charts were analyzed and interpreted by the examiner.

If stress patterns associated with specific relevant questions were observed by the examiner, an opportunity was given for the subject to provide additional clarification regarding stress.

Provide a conclusion regarding the outcome of the CVSA examination. If the relevant questions produced a "No Stress" chart, the subject was "cleared" by the CVSA procedure then procedure will be turned over to the requesting agency.

More Importantly, This Study Substantiates The Cvsa Is A Useful And Predictive Decision Support Tool For Separating The Innocent From The Guilty, And Conclusively Demonstrates The Cvsa's Ability To Discriminate Stress From No Stress In The Human Voice

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This field study of criminal suspects and persons of interest is based upon actual CVSA examinations conducted by Prof. James Chapman over an 18-year period.