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We were making some joke about how i could read chinese. i caught the three letters at the bottom that said ddx. of course, that's about the navy's next destroyer. we translated that note and the note went from being a note to being a tasking list which clearly demonstrated chi mak was receiving guidance or direction to steal what he was stealing., clearly demonstrated chi mak was receiving guidance or direction to steal what he was stealing. >> a tasking list is something that the handler, the foreign government, gives the individual and says these are the technologies we want. and in his cas...

Information being leaked to china. >> we have to have the evidence. our greatest fear initially was, will we catch chi mak doing what we thought he was already doing? >> the allegation itself is not enough to be able to conduct a search warrant into a house or monitor through their telephone. so on the chi mak investigation, we began by doing dumpster diving. >> that's one method that doesn't give notice to the person we're investigating that we're involved. we look at it when they don't know we're looking at it. you're looking through trash that's been sitting there at least a week. usually i...

I'm ssa jim gaylord. i supervise the southern intelligence squad in southern california. we were called to headquarters. they didn't tell us what it was about. before we could be exposed to the information we were given about this case, we had to be polygraphed. that's never happened to me before. so i knew the information itself was very sensitive, so they were taking extra steps. steps that i'd never had to take before. >> where did the information come from? >> i can't actually tell you how we got the information. i'm not trying to be coy, but we also have to protect our sources. we sat dow...

A 24-plus year sentence in prison. >> the rest of the family had served out their sentence and had been deported to china. chi got a just sentence and we learned a great deal about the chinese method of operation. the case demonstrates how the chinese used family to submit espionage. in a family you can trust one another and you know who they are and allows them to have natural relationships, but the results of our investigation, we caught a family who was committing espionage. we caught a family of spies. >> this ended up being a milestone case. it showed that we could convict people on these...

Of made us wonder, is this actually a marriage in the ordinary sense or more of a contract? more of a partnership. more of something the chinese government had put together to serve its own purpose. in our investigation, we also started following his brother tai mak and his sister fuk li and his son billy mak. it gave us information about who tai mak was and what his role was. >> we believe they were sent to the united states in 2001. tai mak's job was to be the courier of information that chi mak stole. >> tai mak was an integral part of this operation. >> now that we had the well, we continu...