Enlarge / Elizabeth Holmes, founder of Theranos Inc., arrives at federal court in San Jose, California, on Wednesday, Dec. 8, 2021. Confronted with tough questions on the witness stand last week, as she defends herself against criminal fraud charges, Holmes admitted to errors on several occasions. (credit: David Paul Morris/Bloomberg) In Elizabeth Holmes’ sixth day on the stand, the prosecution sought to undermine her previous testimony one piece of evidence at a time. On the stand, Holmes admitted to some mistakes.