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Complete cycle, that you've stolen it and transferred it to a foreign power. by watching tai take the information and go through security, we're able to complete that charge that he's now committing espionage because he's flying through china in order to give it away. >> the operation to arrest tai mak and his wife at los angeles international airport was extremely complicated. >> it's not just taking down one person in one place. we had to do multiple arrests simultaneously. we have to make sure we knew where chi and rebecca were. phao, billy, tai and fuk all at the same time. prior to the ar...

Intelligence squad in southern californi 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 down and we were told that china was stealing u.s. ...

Give information. that's very typical trade craft for a spy. >> so we took the safest course and sent agents along with them who would watch them and make sure they didn't meet or pass any information to other people. and from what we could tell, they didn't pass any information. but the alaskan cruise, that was our opportunity, i knew, to go inside his house, covertly. we had to see what he had stored, who his contacts were, if he had any letters or correspondence with people in china. that was an important moment in the case to get inside. this was our opportunity to go in and see what he ha...

The store gave him free coffee and that's why he went every week. >> [ inaudible ]. >> sure. sure. time and time we'd doubt. >> the investigation wasn't going well. i wasn't sure we were on the right track. from the beginning of the case, we saw no communication between chi mak and anyone in china. but you have to be patient for your opportunity. if we push any more, we might reveal ourselves to chi mak. so it's a waiting game. we're waiting for the next time he steals information and tries to send it to china. >> i believe jim was under a lot of pressure. you have to remember, we were using a...

As an employee of power paragon. >> chi mak was a very good electrical engineer. he was the go-to guy in power paragon. >> chi mak had extraordinary access and was highly placed at work. he was trusted by the u.s. government experts. he worked with them side by side. >> chi mak worked on some of the most sensitive navy technologies. technologies that would take the navy into the next century. >> we know he gave the chinese government information regarding the virginia class submarine, which is our newest sub. and ddx information, which is our newest destroyer. most advanced destroyer in the wo...