From private investigators to a 5-hour meeting with superstar lawyer David Boies, here are the lengths Theranos went to contain The Wall Street Journal's bombshell story

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When Theranos learned what Wall Street Journal reporter John Carreyrou was digging into, the company went through some tremendous lengths to get ahead of the story.

In Carreyrou's new book, "Bad Blood," he details the legal sit-downs with superstar lawyer David Boies, and the suspected private investigators that tailed some of his sources after the company suspected they were speaking with him.

"The heavy-handedness of the tactics they used against my sources and against me was something I had never seen in 20 years of reporting," Carreyrou told Business Insider.

Veteran Wall Street Journal reporter John Carreyrou hadn't experienced anything like it.

As Carreyrou started his investigation into Theranos and its blood testing technology, he encountered a team of lawyers who put pressure not only on him but on sources they suspected he'd been talking to. See the rest of the story at Business InsiderNOW WATCH: BlackRock's 1.8 trillion bond chief shares an epiphany he had that reshaped his entire economic outlookSee Also:The Wall Street bankers who feast during recessions say there's a 'smell in the air' and it's starting to feel like 2007The rise and fall of Theranos, the blood-testing startup that went from a rising star in Silicon Valley to facing fraud charges over a wild 15-year spanThe mysterious story of former Theranos president Sunny Balwani, who former employees saw as an 'enforcer' and the SEC charged with fraudSEE ALSO: The mysterious story of former Theranos president Sunny Balwani, who former employees saw as an 'enforcer' and the SEC charged with fraud

DON'T MISS: The reporter who broke the Theranos saga wide open pinpoints the moment he knew he had a big story on his hands

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