Elizabeth Holmes trial: Theranos’ use of workers’ blood led to whistleblower’s concerns
Elizabeth Holmes (C), the founder and former CEO of blood testing and life sciences company Theranos, arrives for the first day of her fraud trial, outside Federal Court in San Jose, California. - Nick Otto/AFP/AFP/TNS

Theranos whistleblower Erika Cheung’s first inkling that the company’s technology fell short of founder Elizabeth Holmes’ claims arose because the startup used its workers’ blood to check how well tests performed, the former laboratory assistant testified Tuesday. “Employees would essentially donate their blood to Theranos for cash,” Cheung told jurors on the second day of Holmes criminal trial, without saying how much was paid. When Cheung’s blood was used to “validate” Vitamin D testing on Theranos machines, “it would always come up that I was deficient,” she testified. But her results didn’...