Since 1979, Snow turned his focus to forensics exclusively. He worked with various human rights groups and brought to attention mass graves of civilians in Argentina, and spent five years training many of the founding members of the Argentine Forensic Anthropology Team (Equipo Argentino de Antropología Forense, EAAF). So far, at least five officers in Argentina were convicted partially due to Snow's work in the mass graves. The success of this mission led to the creation of Guatemalan Forensic Anthropology Team as well when survivors of the Guatemalan Civil War sought his help in 1991.
In 1991, Snow traveled to San Vicente, Bolivia, to search for the remains of the American outlaws Butch Cassidy (Robert Leroy Parker) and the Sundance Kid (Harry Alonzo Longabaugh). However, the exact location of the grave was only known with an accuracy of several yards, and the grave excavated was found to contain the remains of a German miner named Gustav Zimmer. No remains were found whose DNA matched that of Parker and Longabaugh's families. The search was the subject of the British documentary Wanted - Butch Cassidy and the Sundance Kid, first shown April 22, 1993 in Channel 4's True Stories series.[4]
In 2004, Snow appeared on the Unsolved History documentary television series episode Hunting Nazis on The Discovery Channel.[6]
As of 2005, Snow lived with his wife near Oklahoma City. He continued teaching at the University of Oklahoma, and he also did occasional lectures for Forensic Science organizations and law enforcement personnel.