Dramatic photographs reveal how breakthrough technology helped police home in on the second marathon bombing suspect 19-year-old Dzhokhar Tsarnaev. The pictures reveal how state-of-the-art thermal imaging cameras helped police track the Chechen terror suspect while he hid on David Henneberry's boat for his final stand off in Watertown following a terrifying week of violence. Henneberry called 911 after spotting blood and what he thought was a crumpled body in his boat, which was sitting in the backyard of his home. Authorities then used a helicopter equipped with a thermal imaging device to confirm that there was a body in the tarp covered boat and that the person was alive.


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