Dan looks back at the death of blood-testing "unicorn" Theranos with ABC News' Rebecca Jarvis, who today launches a 6-part series on the fraudulent company and its founder Elizabeth Holmes.
Go deeper: 3 reasons why Theranos matters
Dan looks back at the death of blood-testing "unicorn" Theranos with ABC News' Rebecca Jarvis, who today launches a 6-part series on the fraudulent company and its founder Elizabeth Holmes.
Go deeper: 3 reasons why Theranos matters