in the restaurant? >> i'm kind of back in a corner, yeah. >> he watched the student have a few drinks, and when he left, the detective snagged the dirty beer mugs and sent them out for dna testing. the results would take weeks, leaving a town full of young people on edge. >> dads and moms were telling their college age kids, be alert everywhere you go. go with people when you go out. don't be alone. and that's a frightening order to give anybody. >> frightening, but sound advice, because in this case, connecting the dots wouldn't be so easy. detectives have a second possible suspect in their sights. jamie's boyfriend is invited to sit down for a polygraph test. coming up -- when we return -- >> failed the test. >> that's a bad sign for you, right? >> bad sign for him. >> when "date line" continues. n. whoa. travis in it made it.