In the latter part of 1975 and the beginning of 1976, a Florida Polygraph Service concluded 716 pre employment examinations, 323 periodic examinations, 9 specific issue examinations (2 homicides, 3 armed robberies, 1 rape and 3 burglaries). An audio tape recording was made of each examination. The tape recordings were submitted for evaluation to a voice stress analyst who had no knowledge of the evaluations made of the polygraph results. The voice stress analyst matched the polygraph evaluations 1045 times out of the 1048 examinations.

Sebastial Sherriff’s Office blind study on Stress Analysis

In 1976 a polygraph examiner submitted 36 audio tape recordings of polygraph examinations to Investigator Marcia Forbus of the Sebastial County Sheriff’s Office in Ft. Smith, Arkansas. She processed the tape through the department’s voice stress analyzer. She matched the polygraph examiner’s evaluations in every test.

http://pvsa.net/main/page_research.html

The voice stress analyzer used in the above blind study was the Mark II Voice Analyzer. see http://www.youtube.com/watch?v=6E_E5LA_mz4

Voice Stress Analysis (VSA) Technology

(225 ILCS 430/4) (from Ch. 111, par. 2404)
(Section scheduled to be repealed on January 1, 2012)
Sec. 4. Registration or license required; exceptions.
(a) It is unlawful for any person to administer detection of deception examinations, or attempt to hold himself out as an Examiner, unless registered or licensed by the Department. However, this shall not prohibit the use of detection of deception equipment by a person licensed to practice medicine in all its branches under the Medical Practice Act of 1987 when the results are to be used in research.
(b) Nothing in this Act prohibits the use of a voice stress analyzer by any fully trained full time certified law enforcement officer of a law enforcement agency in the course of its duties as an investigative aid in a criminal investigation. Law enforcement users of a voice stress analyzer shall be trained in a manner approved by the Illinois Law Enforcement Training Standards Board. The use of a voice stress analyzer shall be conducted only with the prior written consent of the subject of such investigation. Surreptitious use of a voice stress analyzer is prohibited. Use of a voice stress analyzer is prohibited when a State or local law enforcement officer stops a motorist for an alleged violation of the Illinois Vehicle Code. A voice stress analyzer is prohibited for use in pre�employment screening and for internal investigations. For the purposes of this subsection (b), “voice stress analyzer” means an investigative tool that records voice stress factors related to frequency modulations in the human voice.
(Source: P.A. 93�619, eff. 12�15�03.)

Respectfully,

Alan R. ENGEL
Security – Investigation Consultant

State of Illinois
Sr. Enforcement Investigator (Ret.)
Dept.of Financial & Prof.Regulation
Div.of Professional Regulation

State of Illinois
Licensed Private Detective (Ret.)

Licensed Private Security Contractor (Ret.)

P. O. Box 2712,
Orland Park, IL. 60462-1094

The Investigator who seeks JUSTICE is on a CRUSADE
The Investigator who seeks TRUTH is fulfilling a PROFESSIONAL RESPONSIBILITY

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