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{{Main|Lie detection}}
The question of whether lies can be detected reliably through [[nonverbal communication|nonverbal]] has been the subject of frequent study. While people in many cultures believe that deception can be indicated by behaviors such as looking away, fidgeting, or stammering, this is not supported by research.<ref name="Vrij" /><ref name="Zimmerman">{{cite journal |last1=Zimmerman |first1=Laura |title=Deception detection |journal=Monitor on Psychology |publisher=American Psychological Association |date=2016 |volume=47 |issue=3 |page=46 |url=http://www.apa.org/monitor/2016/03/deception.aspx |access-date=8 December 2021}}</ref> A 2019 review of research on deception and its detection through nonverbal behavior concludes that people tend to overestimate both the reliability of nonverbal behavior as an indicator of deception, and their ability to make accurate judgements about deception based on nonverbal behavior.<ref name="Vrij">{{cite journal |last1=Vrij |first1=Aldert |last2=Hartwig |first2=Maria |last3=Granhag |first3=Pär Anders |title=Reading Lies: Nonverbal Communication and Deception |journal=Annual Review of Psychology |date=4 January 2019 |volume=70 |issue=1 |pages=295–317 |doi=10.1146/annurev-psych-010418-103135 |pmid=30609913 |s2cid=58562467 |url=https://www.annualreviews.org/doi/10.1146/annurev-psych-010418-103135 |access-date=8 December 2021 |issn=0066-4308}}</ref><ref name="Seigel">{{cite journal |last1=Seigel |first1=Jessica |title=The truth about lying |journal=Knowable Magazine |date=25 March 2021 |doi=10.1146/knowable-032421-1 |url=https://knowablemagazine.org/article/mind/2021/the-truth-about-lying |access-date=8 December 2021 |doi-access=
Polygraph "[[lie detector]]" machines measure the physiological [[stress (medicine)|stress]] a subject endures in a number of measures while giving statements or answering questions. Spikes in stress indicators are purported to reveal lying. The accuracy of this method is widely disputed. In several well-known cases, application of the technique has been shown to have given incorrect results.{{Example needed|s|date=December 2021}} Nonetheless, it remains in use in many areas, primarily as a method for eliciting confessions or employment screening. The unreliability of polygraph results is the basis of the exclusion of such evaluations as admissible evidence in many courts, and the technique is generally perceived to be an example of [[pseudoscience]].<ref>Conti, Alli. [https://www.vice.com/en_us/article/qbeaeq/are-lie-detector-tests-complete-bullshit-1117 "Are Lie Detector Tests Complete Bullshit?"] {{Webarchive|url=https://web.archive.org/web/20171208004101/https://www.vice.com/en_us/article/qbeaeq/are-lie-detector-tests-complete-bullshit-1117 |date=8 December 2017 }} ''VICE''. 17 November 2014. 7 December 2017.</ref>
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