Lasso of Truth period before, during and after World War I, on understanding and perfecting the systolic blood-pressure test while working on his Ph.D. in psychology at Harvard University. Blood pressure was one of several elements measured in the polygraph tests that were being perfected since as far back as Italian criminologist Cesare Lombroso, in 1895. Marston's wife, psychologist and lawyer Elizabeth Holloway Marston, one of his inspirations for the Wonder Woman character, also played a key role in his lie detector research. But the lie detector had nothing to do with Marston's creation of the Magic Lasso. Wonder Woman's "Magic Lasso" or
Leonarde Keeler to Larson who had developed a multi-tasking polygraph. After graduating from high school, he enrolled at the University of California, Berkeley in the fall of 1923. He moved shortly after that to enroll in UCLA to follow Vollmer who accepted a new job as the Chief of Police for Los Angeles. In 1924, Keeler’s first handmade polygraph instrument, which he called "the Emotograph," was destroyed in a fire at his residence. On February 2, 1935, he conducted the first use of his invention, the Keeler Polygraph—otherwise known as the lie detector. Keeler used the lie detector on two criminals in