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When does hype cross the line into illegal activity?

That’s the big question animating criminal and civil probes into Theranos, the once high-flying Silicon Valley startup that aimed to revolutionize medical testing by developing technology that could perform an array of lab tests with just a few drops of blood.


The company, once valued at $9 billion, has faced sharp questions about the validity of its tests. Federal regulators have proposed banning CEO Elizabeth Holmes from the blood-testing industry for two years because of problems in a Theranos lab that have not been resolved.

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