India, Feb. 23 -- Pima County Sheriff Chris Nanos has said that there are some problems with the DNA evidence collected from Nancy Guthrie's house, and it could take up to a year for a private Florida lab to resolve. Last week, Nanos told NBC News that DNA recovered by local cops from Nancy's home does not match her, family members, or people who worked in the home. However, it is mixed with the 84-year-old's DNA, and the samples are not complete.

"Our lab tells us that there's challenges with it, and we understand those challenges," Nanos said. "But our lab also knows that the technology is moving so fast and in such a frenzy that they think some of this stuff will resolve itself just in a matter of weeks, months or maybe a year, to all...