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When US prosecutors charged an Apple Inc. engineer in January with stealing trade secrets for a Chinese startup, a search of his home turned up something else, they say: a classified file from the Patriot missile program that belonged to his former employer, Waltham-based Raytheon Co.

The discovery adds a striking national security wrinkle to an otherwise routine corporate espionage case, and the government says it merits keeping Jizhong Chen under close scrutiny.

The Patriot document was discovered among numerous electronic devices and paper files from Chen’s former employers including General Electric — some of which were stamped “confidential,” according to prosecutors.

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Chen, a US citizen who was arrested on his way to catch a flight to China, is awaiting trial on charges that he collected photos, schematics, and manuals from his work on Apple’s tightly guarded self-driving car project as he prepared to take a job with an unidentified rival.

He has pleaded not guilty and remains free on $500,000 bail. But prosecutors argue a stash of sensitive data found in Maryland justifies subjecting him to location monitoring with an electronic device so he doesn’t disappear before his trial.

Lawyers representing Chen and a second former Apple engineer facing similar charges — who is also fighting prosecutors over the need for location monitoring — contend the government is exaggerating the risk they’ll try to flee.

The 2011 document relating to one of Raytheon’s best-known weapons was so secret that it “was not (and is not) permitted to be maintained outside of Department of Defense secured locations,” prosecutors said in an Oct. 29 filing that had not previously been reported on by the news media. Chen has, “for over eight years, illegally possessed classified national security materials taken from a former employer.”

How a classified document ended up at an engineer’s home raises provocative questions, but they’re unlikely be answered in open court at a hearing set for Monday in San Jose, Calif. A prosecutor and an attorney for Chen both declined to comment ahead of the hearing. A Raytheon spokeswoman didn’t respond to a request for comment.

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After prosecutors first raised concerns about the evidence found in Maryland, a magistrate judge agreed in March to extend an electronic monitoring requirement to give the government time to investigate. She ordered an end to the monitoring in October, but prosecutors are asking a district judge to overrule her.

Lawyers for Chen say prosecutors have had enough time to present any further evidence of criminal conduct. They also note the federal office that supervises defendants on probation has concluded monitoring is no longer necessary, because Chen has complied with all the conditions of his release and found full-time employment.

Daniel Olmos represents both Chen and Zhang Xiaolang, who also worked on Apple’s autonomous driving project before he was arrested in July 2018 and accused of trying to take the company’s trade secrets to China-based XMotors. The lawyer makes an argument that goes to the heart of the cases against both men: There’s no evidence Apple’s intellectual property was shared with a third party. That’s significant, because possession of the information alone isn’t necessarily a crime.

Olmos also contends each of the engineers has strong US ties and the trips they were about to take to China when they were arrested were for visiting relatives, not escaping prosecution.

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