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The Human Factor was a 1979 science fiction film directed by Michael Crichton. It starred George Segal as Dr. Edward Walden, a psychiatrist who develops an automated lie-detecting machine to aid him in court cases involving perjury and murder. However, the machine, named "Psycho-Lie," starts to malfunction and begins to detect lies from everyone it is used on, including innocent people, causing chaos in the city where Dr. Walden practices.