The trial day centered on defense DNA expert Dr. John Gerdes' testimony about chain of custody failures and cross-contamination risks in the LAPD crime lab. After completing his direct examination where Scheck established concerns about several evidence samples, Gerdes faced an extensive and damaging cross-examination from prosecutor Clarke, who systematically attacked his forensic credentials, independence, and internal consistency. Separately, the prosecution moved to compel an audio cassette of OJ Simpson's voicemail to Gretchen Stockdale from the night of the murders, with Judge Ito scheduling an evidentiary hearing after identifying an unresolvable factual dispute.

• Judge Ito ordered Dr. Gerdes' government grant proposal held under court custody to resolve discovery dispute.
• Scheck completed three-part direct examination of Gerdes, establishing chain of custody failures in Bronco console samples and potential cross-contamination issues.
• Judge sustained multiple Clarke objections blocking Gerdes' opinions on the Rockingham glove, forcing a sidebar on foundational requirements.
• Judge overruled all Scheck objections to prosecution's DNA chart exhibits, clearing the way for Clarke's full cross-examination.
• Clarke systematically exposed that Gerdes has no forensic training, never used the DQ-Alpha kit he criticized, and exclusively testifies for criminal defendants.
• Clarke established that Gerdes' own laboratory has error rates comparable to LAPD's and that Gerdes renaming his 'contamination incidents' chart as 'unexpected alleles' undermines his central thesis.
• Prosecution moved to compel the audio cassette of OJ Simpson's voicemail to Gretchen Stockdale from June 12, 1994—the night of the murders.
• Judge Ito scheduled an evidentiary hearing for Tuesday to resolve factual dispute over whether defense possessed the original or copy of the Stockdale cassette.