Whistleblower testifies to concerns over blood-testing technology in Elizabeth Holmes trial

Erika Cheung, a former lab worker, said she grew concerned about tests on the company’s mini blood-lab machine not passing quality-control checks in the research lab. Theranos would regularly throw out two data points, called “outliers,” to try to get tests to pass quality checks, she said. Choosing the outliers was like “cherry-picking,” she said, and there weren’t rules about which data points to choose.