A probable-lie comparison question technique developed by Richard O. Arther (d. 2007) which he taught at his training school in New York City. It was built upon the methods of the Reid school, of which he was a student. The Arther technique relies heavily on behavioral indicators to assess deception. His question series is unique in that it includes a known truth pseudo-relevant question. Arther taught thousands of students in the U.S. and abroad and focused on the law enforcement sector.