Non-verbalNon-verbal communication communicationPsychology of lying is a way of communicating and conveying messages that is achieved without the use of words, i.e. non-verbally. The most frequently studied channels of nonverbal communicationNon-verbal communication, through which people transmit their messages and receive messages from others, are facial expression, eye contact and gaze, gestures, body posture, touch, and vocal behavior. Apart from the various ways in which this form of communication is realized, non-verbal communicationNon-verbal communication also has numerous functions such as expressing emotions, establishing relationships, establishing identity, regulating verbal messages and others. However, a particular feature that arouses interest in research in this area is the assumption that a large part of non-verbal behavior often takes place unconsciously or automatically. In this regard, there is a widespread opinion that lying, as an often-indispensable part of human interaction, can be recognized by analyzing the non-verbal behavior of a person who is suspected of lying. A lie is considered a deliberate and conscious act of deceiving another person, and the types of lies, with different motives behind them, vary from well-intentioned ones to unacceptable ones that, according to some, can have serious consequences. Understanding subtle cues in body language, detecting shifts in facial expressions, and recognizing patterns of behavior are paramount in assessing potential threats and de-escalating tense situations. In a security environmentSecurity environment, Non-Verbal CommunicationNon-verbal communication plays a critical role in conveying and interpreting information, often supplementing or even replacing verbal exchanges in certain situations. One key aspect is the use of body language and gestures to signal and interpret securitySecurity-related cues.