course, we all know that day that they knocked on the petito family's door. the police did. and said well, the van's there but unfortunately gabby's not. and that was the -- you know, it was the start of the bad news. >> and in all your years i mean of tracking people, does -- does everybody talk to somebody? i mean, is it -- are there people who -- i mean, i'm sure some people have just kind of disappeared and broken off all communication with everyone they've ever known. but the vast majority of people, do they remain in contact while they're on the run with people? >> you know, a lot of them do and -- and in this particular situation, i don't think this was a well-thought-out plan, to be honest with you. i think this was a knee-jerk reaction, as his sister cassie said, he is very familiar with the appalachian trail. he's been there before numerous times. he goes off the grid for a couple of weeks by himself. i think he is hiding somewhere there. i mean, you know, he's dark, he is a obviously off the grid. he is not communicating with anybody. he's going to run out of provisions. he is going to make a mistake or somebody else is and then hopefully law enforcement is,