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You've left another trail in the dust. if they really know their house, they'll come back and say, how did that thing get moved? >> literally there was dust on things and the fib would spray dust and replace the dust we moved so it couldn't be detected. you leave the room exactly how you left it. pretty impressive. >> when we went into chi mak's house, we were surprised at the amount of information he had taken and stored in his home. this house was dense with documents. he had them stacked by the front door, on the kitchen table, in his bedroom, in his computer room, a second bedroom, all ove...

I have that advantage. >> we learned there was a leak inside power paragon, a subsidiary of l-3 communications. most of their work is in electronics. the technology being leaked to china was navy destroyer information and submarine information. in the beginning, we didn't know exactly who was the source of the leak at power paragon. we take a look at a number of factors. we look at travel. we look at access. after we sifted through all the information, it came down to one person. and it was chi mak. >> chi mak was born in china. he moved to the united states with his wife. he became an enginee...

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 methods of operation. the mak case represented how the chinese used family. 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 sorts of charge...

>> the search of the house confirmed he's stealing information, but we didn't have the proof that he was committing espionage. and that would include giving it to a foreign government. we can prove he stole it. we can prove that he traveled, but we couldn't prove that he traveled with the classified documents. that was the next step. that was the smoking gun we needed to go to the next level. >> after the covert entry, the next big break happened. when we recovered something from the trash. >> we were looking through chi mak's trash for almost a year before we found any real high value evidenc...

Discovered that, in fact, they were discussing copying discs and giving them to his brother, how they were going to take these discs back to china. >> based on information we had, we believe the quiet electric drive, the very sensitive navy submarine data is on that disc. >> tai mak then took that disc home and gave it to billy, his son, who was in charge of the ibm thinkpad laptop which had the encryption program on it. >> tai mak wasn't so good at doing the encryption on his own. we don't believe billy was originally part of the plan but tai mak asked his son to help encrypt the information ...