that took it north to kazakhstan. jeff weiss joins us now. to explain this controversial theory. you have a new book out. a lot of people are talking about this. number one, you think somebody possibly tampered with the satellite data. what makes you think that? >> all we know are these satellite pings that were exchanged between the plane and the satellite over the course of six hours. that's all we have. no floating debris. nothing on the seabed. nothing. if you look at the math of those pings, it unequivocally says this plane went south. since we never found anything in the south, is it possible it went north? the only way it could have is if those pings were forged. melissa: forged. but the company behind this system. they haven't used this in the past to track planes president idea the idea it's being used and tampered with feels farfetched.