Sources say Tommaso Cioni underwent a formal polygraph after inconsistencies surfaced in timelines, CCTV footage, and phone data related to the night Nancy Guthrie disappeared. The test, conducted by an independent examiner, was meant to guide the investigation—not prove guilt.
For most of the session, Tommaso appeared calm. His physiological responses remained stable through questions about his movements and phone activity, with no major signs of deception in roughly 90% of the test.
That changed with the final question: not when he last saw Nancy, but how. Investigators report a long pause, altered breathing, and a sharp spike in stress indicators—breaking the earlier pattern. The examiner halted the test, calling the reaction inconsistent with his previous responses.
Police stress a polygraph isn’t proof of guilt. Still, they say this moment redirected the investigation, prompting renewed scrutiny of vehicle data, call logs, and the timeline of Nancy’s final hours.
What stood out, detectives say, wasn’t fear—but recognition.