Article continues below advertisementThe investigation into Nancy Guthrie's disappearance is taking another turn - and now, a new detail could play a key role.On Thursday, April 16, Brian Entin, who has been closely following the case since day one, revealed on his podcast, "Brian Entin Investigates," that "some DNA evidence from Guthrie's home has been sent to the FBI's lab for advanced analysis," per a source who spoke with him.Article continues below advertisementSource: Brian Entin/YoutubeBrian Entin revealed that DNA evidence from Nancy Guthrie's home is now being analyzed by the FBI.