Detecting Deception Steven Van Aperen Australian Polygraph Services 23rd November 2006.
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Transcript of Detecting Deception Steven Van Aperen Australian Polygraph Services 23rd November 2006.
All truths are easy to understand once they are discovered; the point is to
discover them.
Galileo Galilei
Types of lies
“I wasn’t involved in match fixing, I always played to win”
“I studied psychology at University”
“I did not have have sexual relations with that woman Monica Lewinski”?
Lying in Employment
One third admitted to lying on CV47% lied about leisure pursuits28% about their salary19% about personal skills & qualities3% about criminal record
Lying in Employment18% think its necessary to lie on CV’sOne fifth believe employers don’t check6% say that they would just say they made a typing error!30% admit to lying but managers think only one in ten (10%) CV’s contain false information 36% believe it is the responsibility of employers to check accuracy
The Qualifying Statement
The subjects response may be literally true because they deny some narrow issue of the interviewer’s question
Lying by generalisation
Often a person will lie by generalisation. This occurs when a person may be vague or non-specific in response to a question.
Verbal Responses
Truthful people answer specific questions with
direct, spontaneous and realistic words
PN: They’re now with you are they? MB: Yeah I’ve actually transported the female, Sally.
MB: Um ah yes she’s asl um she’s half asleep anyway
Police negotiator (PN) and Martin Bryant (MB)
28th April, 2000 re Sally Martin
PN: She’d be very frightened and she’s an elderly lady.
MB: Yeah I got her upstairs so
PN: So you can imagine that the trauma that she’s going through
MB: She’ll be fine I mean they could eat well
Police negotiator (PN) and Martin Bryant (MB)
28th April, 2000 re Sally Martin
PN: Are you prepared to let me talk to Sally
MB: Ah unfortunately um she’s down stairs with David now I’ve got um another chap with me.
Police negotiator (PN) and Martin Bryant (MB)
28th April, 2000 re Sally Martin
Past & Present Tenses
Singular person past tense vs present tenseLook for changes between past and present tense
It was Monday night. I was walking down the road. It was getting dark when a man ran up and punched me in the faceIt was Monday night. I was walking down the road. It was getting dark and a man runs up and punches me in the face.
• “My children wanted me. They needed me. And now I cant help them.” Susan Smith (mother)
• “They’re OK. They’re going to be home soon.” David Smith (father)
Shapelle Corby “I didn't put it there” (4 times)
“This is not mine”
“I'm innocent” (twice)
“I didn't put it there that’s the bottom line I didn't put it there.”
“They're not my drugs. I didn't put them there.”
“I’m innocent.”
John Myles Sharpe plea for the return of Anna Kemp & Gracie Sharpe
Did you kill your wife and daughter?
•“I haven't harmed my wife or my daughter”
•“The child belongs with the mother”
SummaryLearn to understand and read body languageAre questions being answered or is the person being evasive, omissive or dismissive?Observe what the person is doing as well as listening to what they are saying