Elizabeth Holmes denies deception at her criminal trial

Elizabeth Holmes, center, walks into federal court in San Jose, Calif., Monday, Nov. 22, 2021. Holmes is accused of duping elite financial backers, customers and patients into believing that her startup was about to revolutionize medicine. (AP Photo/Nic Coury)

SAN JOSE, Calif. (AP) - Biotechnology entrepreneur Elizabeth Holmes, a former billionaire accused of engineering a massive medical scam, expressed some remorse while on the witness stand Tuesday, but denied trying to conceal that her company's blood-testing methods weren't working as she had promised.

In her third day of testimony during the high-profile criminal trial, Holmes acknowledged making some mistakes as CEO of Theranos, a company she founded in 2003 when she was just 19. But she repeatedly emphasized that she made most of her decisions with the help of other executives and a respected board that included former cabinet members in various presidential administrations.

Holmes, now 37, also made it clear that she never stopped believing that Theranos would revolutionize health care with a technology that was supposed to be able to detect a wide range of diseases and other problems by testing just a few drops of blood.

"It