SAN JOSE, Calif.—In the more than seven years since Erika Cheung quit Theranos Inc. over her concerns about the blood-testing company’s practices, she has spoken out widely about her experiences—to regulators, in an HBO movie and on the public stage in a TED talk.
Now, she is telling her story again, this time at the criminal trial of Theranos founder Elizabeth Holmes, who is battling accusations that she defrauded patients and investors with promises that her technology could test for a wide range of health conditions using just a few drops of blood from a finger prick.
