From: UFO UpDates - Toronto <updates@globalserve.net>
Date: Thu, 24 Jul 1997 03:42:02 -0400
Fwd Date: Thu, 24 Jul 1997 03:42:02 -0400
Subject: Voice Stress Analysis - a follow-up
From: http://www.polygraph.org:83/voice.htm
Polygraph vs Voice Stress.
Department of Defense Polygraph Institute
VOICE STRESS ANALYSIS POSITION STATEMENT
September 11, 1996
Background
The polygraph measures predictable changes in a person's body
that are associated with the stress of deception. These changes
include alterations in heart rate, breathing, and electrodermal
activity (emotional sweating). Many other changes occur as well:
the pupils get larger, digestion slows, the body's blood supply
is redistributed away from the skin and gastrointestinal regions
and toward the muscles, etc. The measures used by the polygraph
were selected in the 1920s and 1930s because they were simple to
record (as opposed to brain waves or gastrointestinal activity),
they were sensitive (even minor changes in stress levels caused
these physiological changes to occur), and they were accurate.
Starting about 25 years ago, serious efforts were made to use
the voice to detect deception. Many devices were marketed for
this purpose. The most widely advertised devices have been the
Psychological Stress Evaluator (PSE), the Hagoth, the Mark II
Voice Stress Analyzer (VSA), and the Computerized Voice Stress
AnaIyzer (CVSA). If effective, voice analysis offers many
advantages over current polygraph methodology. Voice samples can
be recorded without discomfort to the subject. Examinations could
be conducted remotely, both in distance, using a telephone or
radio link, or in time, using a tape recording. In rare cases, it
could even be conducted after a person's death, if a recording
made under proper technical, psychological, and investigative
conditions existed. The recordings could also be conducted
surreptitiously and would be of great benefit in intelligence and
counterintelligence investigations, international negotiations,
etc. If effective, voice stress analysis could significantly
improve the nation's security.
The Department of Defense Polygraph Institute has investigated the
scientific value of voice stress analysis. We reviewed the
research literature on voice stress analysis. Only one voice
stress device, the CVSA, is being widely marketed. We purchased the
CVSA, and sent two researchers to the CVSA school for training by
the manufacturer. We conducted several studies on voice stress
analysis, using standard laboratory voice equipment and software
and also using the CVSA device.
We solicited the manufacturer's advice in designing the CVSA
studies, and used both our own scientists and CVSA practitioners
recommended by the CVSA manufacturer to gather the research data.
Conclusions
1. To date, we have found no credible evidence in information
furnished by the manufacturers, the scientific literature, or in
our own research, that voice stress analysis is an effective
investigative tool for determining deception.
2. A very few studies have found that voice stress analysis worked
better than chance at detecting deception. Unfortunately, these
results are not consistent, nor are the reported accuracies nearly
as good as those normally reported for the polygraph. Hundreds of
studies have shown that when properly trained examiners use the
polygraph under controlled conditions, their decisions can be
highly accurate in discriminating between truthful and deceptive
people.
3. The preponderance of evidence indicates the polygraph is far
more accurate at detecting deception than is voice stress
analysis. No Department of Defense agency uses any form of voice
stress analysis for investigative purposes.
________________________________________________
From: http://legal.firn.edu/muni/palmbch/employme.html
The Palm Beach Police Department
EMPLOYMENT OPPORTUNITIES AND REQUIREMENTS
The Palm Beach Police Department is a progressive organization
offering unique careers in law enforcement. New officers are
assigned to the Patrol Division, with the possibility of
transfer to specialty units after a one-year probationary
period. All patrol officers work five-day, forty-hour weeks.
The Department currently employs 69 sworn and 52 civilian
personnel.
Palm Beach is very unique in character and demands the
highest level of service and the utmost in professionalism
from its personnel. The Department emphasizes efficiency and
excellence in law enforcement.
[snip]
THE SELECTION PROCESS
PHYSIOLOGICAL PROFILE: Consists of a series of events
assessing your physical abilities. A description will be
provided by the Personnel Department.
SWIMMING SKILLS TEST: A skills test examining basic water
survival skills, conducted by Palm Beach Lifeguards.
ORAL REVIEW BOARD INTERVIEW: The interview provides
evaluation of employment and educational history; ability
to relate well to others; reasoning and problem-solving
skills in answering situational questions; and
communication skills.
VOICE STRESS ANALYSIS: The voice stress analysis test will
be used to verify information obtained from both the
application and the Oral Review Board Interview.
[snip]
________________________________________________
From: http://www.chp.ca.gov/recruiting/selection.html
Selection Process for Cadet, CHP [California Highway Patrol]
[snip]
Candidates selected to continue in the hiring process are subject
to the following:
Psychological Evaluation:
Includes a written examination and personal interview with a
licensed psychologist
Background Investigation:
Determines the candidate's suitability to be a peace officer. As
part of the Background Investigation, all candidates will be
required to undergo a truth verification examination. A Computer
Voice Stress Analyzer will be used to verify the veracity and
accuracy of information submitted regarding the use of controlled
substances, driving, criminal, medical and employment history and
other job-related factors.
[snip]
________________________________________________
From: http://www.dps.state.mo.us/dps/msfs/dfsinvst.htm
Division of Fire Safety
Office of the State Fire Marshal [Missouri]
[snip]
Several Division investigators are also trained in the
operation of Computerized Voice Stress Analysis equipment.
This equipment has proven to be invaluable during follow-up
investigations.
[snip]
________________________________________________
Learn about and download a Voice Stress Analysis lie detector
from this page.
From: http://mypage.direct.ca/p/pbdennis/truthvsa.html
TruthVSA: Voice Stress Analysis Freeware.
This text is complete with links to referenced documents and web
sites on the internet. Because it is intended for dissemination
off of the internet as well as on, the convention of surrounding
links with [ square brackets ] to denote them is used, with web
addresses listed at the end. For convienience, both text and
internet style "htm" copies of this document are included in
TruthVSA.zip. Load the htm into your browser for best viewing.
1. All About VSA
2. Download TruthVSA.zip
3. TruthVSA Operating Instructions.
[snip]
We're the computer generation: VSA technology is now freely
available to millions of people! Spread it around!
[ Download TruthVSA.zip now: 50K ]
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