Nancy Guthrie case: FBI prepares for 'parallel realities' while awaiting DNA results

TUCSON, Ariz. — As the Nancy Guthrie case enters week three, investigators and the public are awaiting potentially pivotal DNA results tied to a glove recovered near the scene.

But according to retired FBI agent Jason Pack, even a major forensic development may not be the silver bullet many are expecting.

"From the perspective of an agent who’s sat in that war room waiting on lab results, DNA is one of the most powerful tools we have, but it’s also one of the most misunderstood by the public," Pack told Fox News Digital.