Pima County Sheriff says Nancy Guthrie investigation ‘still growing’

Three weeks since Nancy Guthrie was taken from her Tucson home, investigators are still searching for clues. >> It's never fast enough for the sheriff. I I want it like you.Come on, guys. Let's go. Let's go. Let's find her.But the reality is is I also know that sometimes things take time. >> Late Friday, Puma County Sheriff Chris Nanos sat down with NBC News to take stock of the investigation so far. >> Are there names you're looking into.>> No. Would you say the investigation is growing or shrinking >> in ...