The Last Word with Lawrence O'Donnell - Feb. 10

We have breaking news on day 10 of the search for Nancy Guthrie, the mother of today's show co-host Savannah Guthrie joining us now from Arizona is Mark Santilla, MSNOW investigative reporter. Mark, what is the latest. Well we can tell you according to one law enforcement source, a person is in custody and being questioned right now in the disappearance of Nancy Guthrie. We do know again a person is in custody and being questioned by investigators right now in the disappearance of Nancy Guthrie.Also I shoul ...