Prosecution forensic scientist Gary Sims testified for the full day, presenting detailed DNA analysis of blood evidence from the Rockingham property (glove, socks, driveway), the Bronco interior, and the Bundy crime scene. Sims' testimony methodically connected multiple blood stains to OJ Simpson and the victims through DNA profiling, culminating in population frequency estimates showing extremely low probabilities of random matches. Throughout the day, the defense challenged both the proper labeling of DNA results on exhibits and Sims' expertise to testify about population genetics statistics, with Judge Ito often sustaining objections about how evidence was presented.

• Gary Sims testified about RFLP and PCR DNA analysis of blood from Rockingham glove, socks, and driveway, showing matches to Simpson and victim DNA.
• Defense objected to prosecution's exhibit boards labeling DNA results with victim and suspect names rather than neutral 'not excluded' language, forcing modification.
• Barry Scheck challenged Sims' qualifications to testify about population genetics statistics, arguing his one-week training was insufficient.
• Sims presented population frequency estimates for Rockingham glove mixture evidence showing probabilities of 1 in 2.1 billion Caucasians and 1 in 41 billion African Americans.
• Prosecution presented DNA analysis from the Bronco interior showing mixtures consistent with Simpson, Nicole Brown, and Ronald Goldman.
• Bundy crime scene walkway blood stains matched Simpson's profile while excluding both victims.