"The topic of lies is discussed in the works of Paul Ekman (1992) and Aldert Vrij (2000). Th e specifi c case of the Russian nation is described by V. Znakov. Unfortunately, the problem of truth during psychophysiological examination has been researched by very few scholars. Th e majority of authors refer to validity and accuracy. No discussion has taken place about how such truth (the facts) is established during psychophysiological examination. "(...)