Wall Street Journal's John Carreyrou began reporting on Theranos nearly a year ago, since uncovering many troubling facts about the fast-rising startup, amid a firestorm of controversy. In October 2015, John informed the public about the co's struggles with its blood-testing tech. This week, it's the Centers for Medicare and Medicaid Services (CMS) findings that Theranos lab poses an immediate danger to patient health. And today, in an exclusive interview, John breaks the news that Walgreens is suspending use of a CA Theranos lab and closing its Wellness Center, effective immediately. Jason and John dive into the details of the story, starting from John's initial tip about something amiss through today's stunning developments. We learn exactly why CMS considers Theranos to be a public health threat; how Theranos Chief Scientific Officer Ian Gibbons, before he took his own life, told his wife that nothing at the company was working; John being repeatedly ignored on requests to interview Founder Elizabeth Holmes; insights on John's reporting, his sources, and the WSJ vetting process; the grave risks of bringing a healthcare product too soon to market; when, if ever, this story will end -- and much more.