>> there was a camera there unplugged. >> reporter: really? >> yes, one of the side exits for the hotel. one of the fire stairs that go down to the first floor. >> reporter: was there any other tampering done? >> the door that was adjacent to where the camera was located the door also had been propped open that night. >> how do you know that? >> the gentleman working as the clerk that night found a rock placed in the door to keep the door from closing. >> well, then they plugged the camera back in, so it's now working again. and at about 6:35 that morning suddenly that camera is pointing straight at the ceiling. >> same camera? >> same camera. tampered with yet again. >> reporter: if that was jason young's work, is it possible he did make the 340 round trip? could he have killed his wife and cleaned up his daughter all in seven and a half hours? without ever being seen? to find out, investigators played a hunch. they visited every gas station along the route.