and attack the weakest link. >> reporter: every airline must meet these new security mandates, but the u.s. is not telling those airlines how to do it. many carriers, though, have decided to conduct these short security interviews, which could be as simple as, "where are you traveling?", "who packed your bag?" >> and i think it's a very good thing at some of these locations. i think it's going to be very seamless. the airlines are accustomed to this type of thing. >> david kerley live with us tonight. the bottom line for people watching, for americans flying back here to the u.s., how many can expect to be interviewed? >> reporter: it's a good chance that they all could, depending on what the airlines decide to do. but if you've flown domestically recently, you've been engaged in these simple security questions. has the bag left your possession? it's the israeli model. airline workers looking for anybody nervous or uncomfortable. david? >> david kerley with us tonight. david, thank you. from louisiana this evening, the search for a suspect in a double homicide at grambling state university. police say the incident began with an argument in a dorm that spilled outside.