India, March 19 -- More than six weeks after Nancy Guthrie disappeared from her Tucson home, a former FBI agent is shedding light on why the investigation may appear to be going in circles.

84-year-old Nancy, mother of Savannah Guthrie was reported missing on February 1 and despite 45 days of searching, there have been no major leads or suspects and authorities have not confirmed where she might be.

In a recent interview with Brian Entin of Brian Entin Investigates, former FBI agent Steve Moore explained that investigators are now likely going back over earlier steps and checking things they may not have focused on before.

Some neighbors questioned why certain leads, like contractors working nearby, were only being looked into now. Moo...