The FBI handbook (2008) and Keppel (1989) both stress communication as paramount. The difference is that the FBI handbook (2008) concentrates primarily on communication within a task force while Keppel (1989) makes getting information out to and allowing information to be passed back from patrol officers a priority. The FBI handbook (2008) suggests having daily e-mail or in-person briefings for all staff involved in the investigation and providing periodic summary briefings to patrol officer and managers. Looking back on a majority of serial murderer arrests, most are exercised by patrol officers in the course of their everyday duties and unrelated to the ongoing serial murder investigation (Egger 1998, Keppel 1989).