According to sources familiar with the investigation, police authorized a formal polygraph examination for Tommaso Cioni after multiple inconsistencies emerged between witness statements, CCTV timelines, and phone location data linked to the night Nancy Guthrie disappeared. The test was administered by an independent forensic examiner and monitored by detectives, with the goal of narrowing investigative focus rather than establishing legal guilt. Throughout the session, Tommaso appeared composed, answering questions about his movements, phone usage, and interactions with other family members without visible distress. Investigators noted that his physiological responses remained stable across nearly all control and relevant questions, leading the examiner to conclude that he showed no significant indicators of deception in approximately 90% of the test. At that stage, the atmosphere in the room reportedly shifted toward cautious confidence that Tommaso might be telling the truth — or at least convincingly maintaining his version of events.
That confidence fractured during the final question. When asked to describe the exact moment he last saw Nancy — not the time, but the circumstances — the examiner observed an abrupt change. Tommaso paused longer than before, his breathing altered, and stress markers spiked sharply compared to his earlier responses. Investigators say this question differed from the rest because it forced a personal recollection rather than a rehearsed timeline. The examiner reportedly stopped the test immediately after recording the response, explaining that the physiological reaction was inconsistent with Tommaso’s prior pattern. Detectives later described this moment as “the crack in the narrative,” suggesting that while earlier answers may have been carefully structured, this final memory triggered an uncontrolled response. Shortly afterward, police requested Tommaso remain for additional questioning and moved to re-examine related evidence, including vehicle data and call logs tied specifically to that timeframe.
