Final answer:
Anxiety may lead to false positives in polygraph tests, and it's possible for individuals to manipulate the results. The statement in question is true as polygraphs are not reliably accurate because of the complex nature of physiological responses to emotions.
Step-by-step explanation:
Anxiety may indeed cause false positives in polygraph tests, which measures the physiological arousal of an individual when responding to questions. The presumption is that physiological arousal, such as increased heart rate, respiration rate, and sweating, would occur when someone is being dishonest. However, the accuracy of polygraphs is contentious because lying does not correspond to a specific physiological pattern, making the distinction between truth and lies less clear. Additionally, it is possible for individuals to 'beat' the polygraph through various methods, which further calls into question the reliability of such tests.
Considering these factors, it can be concluded that the statement 'Anxiety may cause false positives, and people can sometimes "beat" polygraphs' is true. Sophisticated understandings of human emotions highlight the complexity of attempting to differentiate one emotion from another through physiological signals alone.