KEY POINTS
  • Former Theranos lab director, Adam Rosendorff, took the stand for the fourth day in the trial of embattled CEO Elizabeth Holmes.
  • Lance Wade, a defense attorney for Holmes, tried to poke holes in Rosendorff's earlier testimony, "no lab is perfect, right?"
  • Rosendorff testified he was growing frustrated in his "inability to explain discrepant results to physicians."

SAN JOSE, CALIF. -- A former lab director at Theranos acknowledged on Friday that he had plenty of opportunities to address his concerns about the company's technology with former CEO Elizabeth Holmes.

Adam Rosendorff joined Theranos as a lab director in 2013. He testified that he felt the healthcare start-up would become the next Apple. A year later, Rosendorff quit after growing uncomfortable and concerned with the high failure rate of the company's blood-testing technology.