<P> The Official Forensic Files Casebook was published in 2004 . The book recaps and expounds on some episodes, explains how the show is produced, and details why some proposed episodes were turned down . In it, the show's Executive Producer / Writer Paul Dowling says he was inspired to create the show because he had been present in Philadelphia during the outbreak of Legionellosis in 1976, as well as by the murder of Helle Crafts . The CDC's legionellosis investigation eventually became an episode of Medical Detectives, while the Crafts case was filmed as the series' pilot episode . </P> <P> In 2004, Court TV released a limited number of episodes on DVD . As of June 26, 2009, Amazon.com says the DVD has been discontinued by the manufacturer . </P> <P> In August 2011, TGG Direct released 8 DVD collections each containing 12 episodes . These collections include "Historic Cases," "Convictions Overturned," "Death By Poison," "Crimes of Passion," "Kidnapping Cases," "Medical Mysteries," "Serial Killers" and "Sex Crimes ." </P> <P> Not every episode of Forensic Files has been narrated by Peter Thomas, a well - known voice - over talent . Four special hour - long episodes ("Payback", "Eight Men Out", "See No Evil", and "The Buddhist Monk Murders") were narrated by Peter Dean due to a scheduling conflict . These episodes were originally broadcast on TLC in 2001 and aired for the first time on the HLN Network in 2016 . They never aired on TruTV . </P>

How many collections of forensic files are there