Theranos City crystal Erica Cheung ended her testimony at the Elizabeth Holmes trial.

SAN JOSE, California – Erica Cheung, the key whistleblower in the fraud case of Elizabeth Holmes, the founder of Theranos, who failed a blood test, completed her testimony Friday, saying the company preferred her blood. Speed ​​of accuracy in tests and answers to hours of questions by defense.

During the three days of the testimony, Ms. Cheung, a former Theranos employee, explained in detail how the company used its own blood tests. Although the defense sought to demonstrate that Thiranos’ procedures were rigorous and complex, Ms. Cheung said Friday that her priority is to get tested as soon as possible and that her machines often fail their quality control checks.

Ms Cheung said Thiranos’ blood tests could be cheaper than other tests, but that did not mean “misinforming people about their health status.”

Credit …Jeff Krautz / Film Magic, via Getty Images

Ms. Cheung was a high-profile witness for the federal government, trying to make the case that Ms. Holmes deliberately misled investors, doctors, and patients about how well Thiranos’ blood testing technology worked. The company, which was once a shining star with Ms. Holmes as a Silicon Valley success story, broke up in 2018.

Ms. Cheung, who worked as a lab assistant at Theranos for several months in 2013 and 2014 before reporting lab testing problems to federal agents in 2015, testified this week that she was concerned that How the company deletes outliers in its data Devices pass quality control tests. He said his worries about his job had been going on for a month.

During the inspection, Ms. Holmes’ lawyer, Lance Wade, asked Ms. Cheung about the operation, procedures, and organizational chart of Theranos Labs. The point was to point out that the issues that Ms. Cheung raised about the lab’s inaccurate results only applied to a small area of ​​the company.

While Ms. Cheung responded with a sense of duty, recalling Thiranos’ methodology and organizational structure, she replied that her blood testing machines needed to be constantly re-examined and their quality checked. Failed to check. “It could take days to rearrange the machines,” he said.

“We were sleeping in the car because it was taking too long,” he said.

On Friday, Mr. Wade also asked Ms. Cheung about a 2015 letter she had received from David Boyce, then a lawyer in Theranos. In the letter, which Ms. Cheung mentioned earlier in her testimony, Mr. Boyce threatened to sue Wall Street Journal reporter John Carrero over his discussion of Theranos, which the company filed earlier this year. Exposed testing issues.

Mr. Wade noted that Ms. Cheung had received two calls from the Director of Human Resources in Theranos before receiving Mr. Boyce’s letter, but they were not returned.

Ms Cheung later said she did not return calls because she no longer worked at Theranos and the “fear” in the human resources director’s voice reminded her of how scared she was at the company.

“I had the right not to talk to them,” said Ms. Cheung.

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