DEKTOR Psychological Stress Evaluator
Model # 101
|Psychological Stress Evaluator
Manufactured in the early to middle 1970's, the Dektor Psychological
Stress Evaluator Model #101 was the top of the line in stress evaluators.
It’s primary attraction was it’s manufacturer’s
contention that the instrument could be used with little or no training, thus avoiding lengthy polygraph schools and tuition
costs. It fell out of favor in the 1980's when studies indicated that it’s accuracy was about the same as a “flip
of the coin.”
Donated by Pat Flink, Private Investigator
Voice Stress Analyzer
|Voice Stress Analyzer
Trying once again to capitalize on a market they desperately wanted
to invade, Communication Control Systems, Inc. came out with it’s top of the line “Voice Stress Analyzer.”
Using a lot of puffery, they touted the instrument to be as accurate as a polygraph instrument with a third of it’s
cost and training time.
As large as a small suitcase, one of it’s chief advantages
was it’s secrecy. It could be used to tape record a telephone conversation for analysis later. After all,
what could be easier that interrogating suspects over the phone and using this instrument to zero in on a culprit.
Donated by Steven E. Hardwick, Polygraph Examiner.
The "Lie Detecto" Machine
Manufactured by Manning
Manufacturing Company in 1961, this is a simply galvanometer that was made into a toy. It has three possible results: (1)
“Are you Kidding;” (2)“Little Whopper;” and (3) "Big Whopper.” It has two adjustment knobs,
one for sensitivity and one for “adjustment.” Although just a toy, it is probably as accurate at the two voice
stress machines shown above.
The "Truth Quest"
Using some of the same
circuitry as the two voice stress machines shown above, this miniature “lie detector" is marketed by Sharper Image.
It has a series of colored light on the left side starting with green, progressing to yellow, and ending in red. This device
is left on a desk in front of the person being questioned and depending on the number of the colored lights a subject’s
response elicits, it is supposed to determine trughfullness or deception. It simply doesn’t work.
Liar" Truth Detector
This portable lie
detector is about as big as an inverted soup bowl. It is manufactutrer by Paladone in China.
A test subject puts his hand into the harness on the top of the device. Once turned on, a series of lights revolve around
the device for several seconds after the subject answers a question. A series of colored lights progressing from green to
read light up on the front of the device to tell the “examiner” if the subject is lying. One interesting thing
about this device, if it detects what it believes to be a “lie,” it sends a rather uncomfortable shock through
the hand. There are two levels of pain selectable, “Low” and “High.”
One look at the read out on this "portable lie detector" should tell
you that it can't be taken seriously. It manufacturers tout it as a handheld voice-tension detector which measures degrees
of vocal vibration to determine if someone is telling the truth.
Ask your subject three easy "yes" or "no" questions. De-FIB-ulator
records the answers, establishing a baseline reading. Then, ask serious yes/no questions. If the subject isn't responding
honestly, the onscreen face of "Demonochio" grows a long nose and horns.
Purported accuracy is 65 percent. And it even works with cell phones!