India, Feb. 10 -- Television host and legal analyst Nancy Grace has urged the Guthrie family to submit to polygraph tests as the search for Nancy Guthrie reaches a "critical hour" in the investigation.

Appearing on Fox News' Hannity, the Crime Stories with Nancy Grace host said voluntary polygraphs could help eliminate doubt and refocus attention as authorities continue to search for the missing 84-year-old. "Go, hook up to a poly and be done with it," Grace said, referring to polygraph examinations. She added that anyone refusing a test would raise red flags in her view.

Grace was firm in dismissing theories that Nancy Guthrie's disappearance was the result of a medical episode.

"This was not a 'medical' event. We can rule that out," ...