Genetic genealogy that caught notorious killers now used in Nancy Guthrie case

Investigators looking to track down Nancy Guthrie’s suspected kidnappers are turning to a relatively new technology that has been attributed to solving some of the most prolific criminal and cold cases in American history. 

Investigative genetic genealogy (IGG) is defined as "the science of using genetic and genealogical methods to generate leads for law enforcement entities investigating crimes and identifying human remains," according to the International Society of Genetic Genealogy....