strategic reasons to have a warrant outstanding, a federal warrant outstanding. it puts him in the system, if you will. it's called the national crime information center, ncic. that database shares information with law enforcement across the country. it also gets his identifiers into the international system, interpol, if you were to try to cross borders. it puts him in the u.s. customs system. coming up, warning signs gabby petito may have been in danger and possible mistakes made in the investigation. >> there was a missing person and a fiance who came home without this missing person. >> right. >> that's not enough to keep tabs on someone 24/7? >> well, first of all, i'm not saying we didn't do that. (battle sounds stop) ♪ ♪ welcome to allstate. ( phone notification ) where you can pay a little less and enjoy the ride a little more. now, get new lower auto rates.