This column examines the use of professional private investigators in modern day law practice. This column is not about tough guys in trench coats meeting informants in waterfront bars, which is the scenario that often appeared in the movies and novels of the 1930s. It is not about investigators who trail a husband or wife to determine if they are having a secret affair. Unlike the private eyes of yesterday’s literature, today’s private investigators use smart technology and good training in fact finding. Today’s private investigators’ clients are major law firms, large corporations and service industries. Present day private investigators are well trained investigators using modern equipment to locate witnesses, documents, and other physical evidence for use in civil and criminal cases. Modern day private investigators are skilled at questioning possible witnesses to determine who may assist in winning a lawsuit or who can essentially harm a lawsuit. Understanding what a potential witness may say at trial are among the many uses for a private investigator.