India, June 7 -- Pima County Sheriff Chris Nanos recently opened up about the Nancy Guthrie case, explaining why no arrests have been made even months after Savannah Guthrie's mother vanished. In an interview with KOLD-TV, Nanos defended what he called a "tedious" process.

"It's just not like a detective goes out there, talks to somebody, and we can make an arrest. This is a very sensitive case, but what really makes it prolonged is that we do rely on labs," Nanos said. "When you're looking at those labs and the work they do, you have a science there, and science has rules that it has to go by. Even though it's not. DNA, they'll tell you, isn't an exact science - it's 99% plus. So it's pretty close, but you still have to follow rules." ...