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Describing the polygraph as infallible is critical to avoid because it can lead to unrealistic expectations about the test's accuracy and reliability. Polygraph testing is based on the physiological responses of the subject, which can be influenced by a variety of factors, including stress and anxiety, rather than solely by deception or truthfulness. By claiming that the polygraph is infallible, the investigator may mislead both the subject and other stakeholders regarding the test's validity and its ability to definitively determine truthfulness. This can undermine the integrity of the investigation and may affect the willingness of subjects to participate or cooperate, as they may feel their situation is hopeless if they believe the results are absolute. It's essential for investigators to maintain a balanced perspective on the usefulness and limitations of polygraph testing to ensure a fair and effective investigative process.