Prosecutor George Clarke systematically dismantles defense DNA expert Dr. John Gerdes' contamination theory through methodical cross-examination, establishing that multiple independent laboratories obtained OJ Simpson DNA matches despite not involving the allegedly contaminated Yamauchi extraction process. A significant disclosure emerges: DOJ has obtained a three-probe RFLP match showing a mixture consistent with OJ Simpson and Ron Goldman's blood. Clarke successfully questions Gerdes' methodology, presents alternative explanations for flagged 'contaminants,' and demonstrates that LAPD quality controls effectively detected contamination in validation studies.

• Clarke establishes separate swatches from Bundy and Bronco evidence were independently sent to Cellmark and DOJ — labs that never involved Yamauchi's extraction process — yet all returned results consistent with OJ Simpson DNA
• DOJ three-probe RFLP match of Bronco console swatches (303-305) revealed, showing mixture consistent with OJ Simpson and Ron Goldman blood
• Gerdes concedes his 'contamination' notations were often based on faint, difficult-to-see dots and that he reviewed fewer than 100 casework samples
• Clarke introduces alternative explanations for flagged alleles: cross-hybridization and DX gene activity, neither constituting actual contamination
• LAPD validation study photograph introduced showing gross contamination successfully detected and flagged by quality controls, contradicting Gerdes' lab critique
• Technical disruption: courtroom projector fails, forcing exhibits to be marked and passed by hand to jury