True Crime Bullsh**: The Israel Keyes Investigation cover image

0409 | Psychology

True Crime Bullsh**: The Israel Keyes Investigation

00:00

Are You Listening to Changes in Behaviour?

The polygraph is based on changes in behavior. When you're trying to determine if somebody's telling the truth or honesty, your forthcomingness of their words can be a sign that something else is going on. If they deflect by becoming tearful and then quickly change the subject it could indicate an emotional cover-up. The interviewers are looking for those shifts.

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