IE 11 is not supported. For an optimal experience visit our site on another browser.
  • UP NEXT

    When Sandy Met Teddy

    02:06
  • DATELINE FRIDAY SNEAK PEEK: What Happened in Vegas

    01:39
  • A Postcard from the Field: The Biology DNA Detail at the Las Vegas PD

    03:02
  • DATELINE WEEKEND MYSTERY SNEAK PEEK: Trouble at the 7-11 Ranch

    01:20
  • DATELINE WEEKEND MYSTERY PREVIEW: Trouble at the 7-11 Ranch

    00:56
  • DATELINE FRIDAY PREVIEW: What Happened in Vegas

    00:38
  • DATELINE WEEKEND MYSTERY SNEAK PEEK: The House on the Lake

    01:54
  • DATELINE WEEKEND MYSTERY PREVIEW: The House on the Lake

    01:00
  • Hoda Kotb and Jenna Bush Hager Preview 2021: It's Toast!

    00:23
  • DATELINE WEEKEND MYSTERY SNEAK PEEK: After the Party

    01:36
  • DATELINE WEEKEND MYSTERY PREVIEW: After the Party

    00:41
  • SNEAK PEEK - 2021: It's Toast!

    00:37
  • DATELINE WEEKEND MYSTERY SNEAK PEEK: And Then There Were Three

    01:47
  • DATELINE FRIDAY SNEAK PEEK: The Overlook

    01:15
  • DATELINE WEEKEND MYSTERY PREVIEW: And Then There Were Three

    00:55
  • DATELINE FRIDAY PREVIEW: The Overlook

    00:52
  • Hope and Healing

    02:10
  • DATELINE FRIDAY SNEAK PEEK: The Secrets of Nygard Cay

    01:38
  • DATELINE WEEKEND MYSTERY SNEAK PEEK: The Eastlake Conspiracy

    01:28
  • DATELINE WEEKEND MYSTERY PREVIEW: The Eastlake Conspiracy

    00:52

Lie Detector

02:57

On Friday’s Dateline, several potential suspect are asked to take polygraph tests. So, we asked Josh Mankiewicz to tell the truth… about telling lies.