The queries posed during a law enforcement polygraph examination are designed to assess the examinee’s physiological responses to specific inquiries. These questions typically fall into three categories: irrelevant, relevant, and control. Irrelevant questions establish a baseline of normal responses. Relevant questions directly address the matter under investigation. Control questions are designed to evoke a physiological response, serving as a comparison against the responses to relevant questions. For instance, in a theft investigation, an irrelevant question might be “Is your name [examinee’s name]?” A relevant question could be “Did you steal the money?” A control question might be “Before the age of [examinee’s age], did you ever take something that did not belong to you?”
The significance of the questioning lies in its role within the broader investigative process. The results provide investigators with additional data points to consider when evaluating a suspect’s potential involvement in a crime. Historically, these examinations have been used to narrow the scope of investigations, corroborate or challenge existing evidence, and, in some jurisdictions, as a condition of employment for law enforcement personnel. While not always admissible in court, the insights gained from these inquiries can influence the direction of an investigation and inform subsequent actions.
