Witness· Theranos
Erika Cheung
Former Theranos laboratory associate who worked in assay development and clinical testing.
AppearedFederal Criminal Trial
1,401 lines·7 appearances·29 mentions
About
Called by the prosecution, Cheung testified about Theranos laboratory operations, limited Edison testing capability, recurring quality-control problems, proficiency testing, and her escalation of concerns. Cross-examination tested her qualifications and knowledge limits, while redirect clarified the continuing role of quality control after validation.
Trial Record (36)
FederalFederal Criminal TrialAug 31, 2021 – Jan 3, 2022
Testimony (7)
Direct
Erika Cheung — Direct
Day 6DirectErika Cheung — Direct (Resumed)
Day 6DirectErika Cheung — Direct
Day 7DirectErika Cheung — Direct Resumed
Day 7CrossErika Cheung — Cross
Day 7CrossErika Cheung — Cross
Day 8RedirectErika Cheung — Redirect
Day 8Mentioned (29)
sidebar
Sidebar on Cause and Hardship Challenges
Jury Selection Day 1OpeningOpening Statement by the Prosecution
Day 4ProceduralWitness Immunity Application and Ruling
Day 6RedirectSo-Han Spivey — Redirect
Day 6ProceduralEmail Exhibit Admissibility Hearing
Day 6ProceduralHearing on Admissibility of Cheung Email Exhibits
Day 7ProceduralHearing on Cheung Hearsay, Notice, and Prejudice Issues
Day 7sidebarSidebar on Relevance of Cheung's Nonprofit Work
Day 7ProceduralPretrial Evidentiary Hearing on Witness Testimony, Hearsay, and Immunity
Day 8ProceduralPretrial Evidentiary Hearing
Day 9DirectAudra Zachman — Direct
Day 9ProceduralText Message Admissibility Hearing and Rulings
Day 10DirectAdam Rosendorff — Direct
Day 11CrossAdam Rosendorff — Cross
Day 13CrossAdam Rosendorff — Cross
Day 14RedirectAdam Rosendorff — Redirect
Day 16RecrossAdam Rosendorff — Recross
Day 16ProceduralDr. Dhawan Patient-Harm Testimony Dispute
Day 19RedirectKingshuk Das — Redirect
Day 31ProceduralRule 29 Motion and Evidentiary Record Matters
Day 36DirectElizabeth A. Holmes — Direct
Day 39CrossElizabeth A. Holmes — Cross
Day 40ProceduralRenewed Motion to Admit Feedback Reports
Day 42RedirectElizabeth A. Holmes — Redirect
Day 42Charge ConferenceFinal Jury Instructions and Verdict Form Conference
Day 45ProceduralCMS Report Admissibility and Motion-to-Strike Hearing
Day 45ClosingClosing Argument by the Prosecution
Day 46ClosingClosing Argument by the Defense — Continued
Day 47RebuttalRebuttal Closing Argument by the Prosecution
Day 47