Theranos' biggest clients, Walgreens and Safeway, are on the stand this week, testifying to what exactly they say they were told before signing multimillion-dollar deals with the blood testing startup. In email exchanges, text messages and board presentations, the prosecution paints a picture of deception while the defense claims the industry giants should've known better. Plus, we hear from Sunny Balwani's dermatologist of 15 years, who happened to also become Theranos' lab director.

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