The Lie Deflator – The effect of polygraph test feedback on subsequent (dis)honesty

1 Introduction The controversy as to the validity of lie detector tests is very much alive among practitioners and researchers (e.g., Palmatier & Rovner, 2015). Most of the criticism has been directed against the Control Question Test (CQT) (e.g., Fiedler, Schmid & Stahl, 2002; Iacono & Ben-Shakhar, 2019; Verschuere et al., 2011; but see Ginton, 2017 for a favorable evaluation). While most consider the test to be scientifically flawed (e.g., Furedy, 1993; Gallai, 1999; Iacono & Lykken, 1997; Meijer & Verschuere, 2010), others consider it to be a useful indicator to detect involvement in a specific incident (Gibson, 2001), and experienced practitioners are indeed capable of accurately identifying cheating (O’Sullivan, Frank, Hurley & Tiwana, 2009).