Criminalist Gregory Matheson's testimony dominated the day with multiple rounds of redirect, recross, and further examination focused on blood evidence integrity. Prosecutor Goldberg struggled to rehabilitate the People's case on vial volumes and EDTA testing, with Judge Ito sustaining numerous defense objections and instructing the jury to disregard entire lines of questioning. Defense attorney Blasier struck significant blows by showing that key scientific articles actually supported the defense's contamination theory, while also exposing critical gaps in lab security that could allow unauthorized evidence access. A discovery violation motion was filed alleging prosecution withheld evidence during earlier testimony.

• Matheson's overnight experiment revealed 0.4–0.5mL of unaccounted blood, undermining prosecution's defense of the reference vial accounting.
• Judge sustained nearly every defense objection to EDTA testing questions, instructing jury to disregard the entire line of inquiry.
• Defense demonstrated that Yeshion and Grunbaum articles actually support their BA-to-B blood degradation theory, not the prosecution's position.
• Blasier exposed 1.5mL unaccounted for in OJ Simpson's reference vial as of June 20th, 1994.
• Crime lab's physical security records contained significant gaps that could allow unauthorized evidence access to go undetected.
• Barry Scheck filed motion alleging prosecution intentionally withheld original SID document during Dennis Fung cross-examination.
• Judge questioned prosecutor Goldberg's good-faith basis for blood volume hypotheticals that contradicted Peratis's sworn preliminary hearing testimony.