Bob was his company’s best software developer, got glowing performance reviews and earned more than $250,000 a year.

Then one day last spring, Bob’s employer, an American infrastructure company, thought its computer network had been attacked by a virus.

The ensuing forensic probe revealed that Bob’s software code had in fact been the handiwork of a Chinese subcontractor.

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Bob was paying a Chinese firm about $50,000 a year to do his work, then spent the day surfing the web, watching cat videos and updating his Facebook page.

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