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Detecting lies

Detecting lies. Are we good at detecting lies?. Interviewing suspects. Police need to establish guilt or innocence by getting suspects to say something about the events in question.

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Detecting lies

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  1. Detecting lies Are we good at detecting lies?

  2. Interviewing suspects • Police need to establish guilt or innocence by getting suspects to say something about the events in question. • Work in this area has been experimental and in the field-but problem is ethics- people outside the force can not see video clips of a suspects interview as suspects have the right to privacy until their case comes to court

  3. Karen Matthews…..what can you recall about this case? “Please come home Shannon, if you’re out there come home. If anyone’s got my daughter, my beautiful Princess daughter please bring her home safe. I need her home.”Karen Matthews

  4. Karen went on national TV to plead for information to help find her missing nine year old daughter Shannon. Right from the beginning she had been LYING to police….how could they tell? ITV programme ‘Tears, lies and videotape’ capture the lies with experts in the field identifying the lies from this and other cases where lies identified the suspects in the crimes

  5. Key Study ~ Mann et al (2004) Police officers’ ability to detect suspects’ lies To test police officers’ ability to distinguish truth and lies during interviews with suspects. This was a field experiment involving 99 Kent police officers (24 female and 75 males mean age 34.3). These participants were shown 54 video clips involving 14 suspects of real-life police interviews; each clip was backed up by further evidence which established truth or lie. The clips were of head and torso and ranged in length from 6 to 145 seconds. The participants were asked to fill out questionnaires about their experiences of detecting liars and decide if each clip was truthful or a lie. They were also asked to make a note of cues they used to detect the lies. Police Officers performed better than chance (50%) they were 66.2% accurate on lies and 63.6% accurate on truths. The most frequently mentioned cues were gaze, movements, vagueness, contradictions in stories and fidgeting. The police officers were good at detecting lies. However, to establish whether they were any better than the general public would require a control group. This study could not have had a control group because of issues of confidentiality and privacy (the clips were real police interviews).

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