Day 103 was dominated by disputes over DNA statistics, with defense attorney Peter Neufeld challenging the reliability and assumptions underlying Dr. Bruce Weir's population frequency calculations through cross-examination and recross. On redirect, Weir acknowledged errors and presented corrected calculations whose effects varied, while Neufeld elicited testimony about database limitations, percentages of the population not excluded, and omitted statistical adjustments. The day concluded with LAPD criminalist Denise Lewis beginning chain-of-custody testimony for evidence received from the Coroner's office and encountering an unexpected sealed bindle that required her to break a seal and renumber items.

• Neufeld challenged convenience sampling and racial classification in Weir's databases; Weir lacked knowledge of the specific procedures but defended self-reporting and observation, and the used databases excluded Asian Americans
• Three-contributor calculations ranged from 1-in-2 to 1-in-3,500 under different assumed contributor groups; Weir also identified different band counts and different population samples as qualifications
• On redirect, Weir acknowledges errors in his mixture frequency calculations and presents corrected numbers whose effects vary across samples.
• Weir insists his multi-locus calculations are correct and says Neufeld's single-locus presentation tells only half the story.
• Neufeld's recross establishes that Weir's newly presented mixture frequencies omitted the FST adjustment and 99% upper confidence limit, both of which Weir agrees could make the discussed frequencies more common.
• Weir had not previously testified to these methods in a criminal case and was unaware of such U.S. testimony by another expert; he had never examined a DQ-Alpha strip
• Defense objects to late discovery of 33 pages of materials including Susan Brockbank's notes, delaying her cross-examination.
• Lewis recounted finding a sealed soil-and-debris bindle while processing Coroner's evidence in June 1994, opening it to identify its contents and renumbering items to group Goldman's evidence together