Robin Cotton, Renee Montgomery, and Gary Alan Sims testified about DNA testing from Bundy, Rockingham, the Bronco, the glove, and the socks. Cotton said the sock blood was well-preserved and almost certainly did not come from Nicole Brown's degraded autopsy reference sample; Montgomery reported Simpson-consistent results at Bundy and Rockingham while excluding him from most glove areas; and Sims reported high-frequency matches and a Bronco console mixture consistent with Simpson and Goldman. On cross-examination, Blasier challenged RFLP and D1S80 methodology, contamination risks, and statistical interpretation, and argued that Cellmark's two false positives in roughly 100 proficiency samples outweighed the reported match frequencies; he also established that no blood consistent with Simpson was found on either victim's clothing.

• Robin Cotton testified that sock blood was well-preserved and almost certainly did not originate from Nicole's autopsy sample, undermining the contamination defense
• Blasier established that only 3 of 10 RFLP bands were identical yet all counted equally toward statistical match frequencies
• Blasier cited two Cellmark false positives in roughly 100 proficiency-test samples and argued that this error rate swamped Cotton's statistical frequencies
• Blasier elicited that the Bronco steering wheel stain (item 29) contained an unidentified DNA contributor
• Nicole Brown Simpson's reference sample contained a faint B allele identified as Simpson's type
• Renee Montgomery admitted D1S80 testing is relatively new and not highly discriminating, with population alleles ~30% common
• No objective standards exist for distinguishing 'hint' from 'trace' in DNA analysis—a distinction determining inclusion or exclusion
• No blood consistent with Simpson was found on either victim's clothing, while testing identified cross-contamination between the victims' clothing
• Simpson's DNA on the Rockingham glove appeared only in the wrist area, not in the fingers or palm
• Baker said an off-hand comment by Judge Fujisaki signaled bias against the defense; the judge apologized and agreed to apologize before the jury