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Journalists and lawyers are targets for the contacts they have, college pfessors and students for their state of the art research, and business travelers because of internal memos, studies, and trade secrets that other countries and companies want. >> they have economic interests in wanting to learn trade secrets, business processes, new development, new information technologies. if they can shave a year off of designing a new airplane engine, they can save billions of dollars for their economy. >> reporter: avoiding such spying is not easy. you can travel with cheap disposable phones, encrypt...

Negotiate with other countries. >> reporter: so, who and what are they after? journalists and lawyers are targets for the contacts they have, college professors and students for their state of the art research, and business travelers because of internal memos, studies, and trade secrets that other countries and companies want. >> they have economic interests in wanting to learn trade secrets, business processes, new development, new information technologies. if they can shave a year off of designing a new airplane engine, they can save billions of dollars for their economy. >> reporter: avoidi...

Of us in most of our travels will not be spied upon, but securities experts widely agree if you work in high-tech or military or other sensitive areas, the odds go up that when you go to look at the sites around the world, someone might also be looking at you. erin? >> really interesting point, tom foreman, thank you, and thanks for that series, all of which, all of tom's pieces this week you can see on our blog "outfront." and shocking new details about the oklahoma thrill killing, what may have led three teens to allegedly kill a man. we have an exclusive interview with one of the akude's ...