BRIAN ENTIN INVESTIGATES
Nancy Guthrie InvestigationPolygraph TestsTrue Crime
Polygraphs in Nancy Guthrie case — how they could be narrowing the search to find a suspect
Former Scott Peterson case detective John Bueller reveals how polygraphs are used to narrow suspect pools and details critical investigative steps that could solve the Nancy Guthrie abduction.
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Nancy Guthrie investigationMissing personsPolygraph tests
Is Nancy Guthrie in Mexico? Polygraph tests and new potential leads - on the scene in Arizona
The Nancy Guthrie investigation reveals new details, including the use of polygraphs, FBI contact with Mexican authorities, and an increased reward, while an ex-FBI agent analyzes the suspect's potential movements and the unique challenges of the Tucson terrain.
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