Perhaps one of the most important aids the FBI gives local authorities is in locating missing witnesses. Under the law, if a witness in a local criminal case involving a penitentiary offense is served with a subpoena, and evidence is found that the witness has left the state, your FBI has jurisdiction under the law covering unlawful flight to avoid giving testimony. Such cases are actually manhunts, for a person in hiding can flee to any corner of the country, change occupation, appearance and habits. Your FBI secures a warrant for the witnesses arrest, and then comes the real job. The job of serving that warrant...