tense DNA analyst Renee Montgomery testified for the prosecution about D1S80 typing results from crime-scene evidence. On cross-examination, the defense elicited that she had not performed a D1S80 test before developing and running the program for this case, that D1S80 had little prior casework use, that applicable guidelines were voluntary, and that proficiency tests were internally prepared and non-blind. Montgomery also acknowledged several atypical technical issues and confirmed that Simpson was excluded as a contributor from all 23 stains tested on the victims' clothing.
- Renee Montgomery described her training and began direct testimony on the D1S80 marker system
- Montgomery admitted she had never performed D1S80 testing before being assigned to develop the program for this case
- Defense established D1S80 had limited prior casework use, only voluntary guidelines, and internally-prepared proficiency tests
- Montgomery conceded Simpson is excluded as a contributor from all 23 stains tested on the victims' clothing
- Prosecution presented D1S80 results from Bronco and Rockingham glove showing mixtures and single-source results consistent with specified reference individuals
- Cross-examination addressed multiple technical anomalies, including gel distortions, shadow bands, and control-band intensity discrepancies
- For glove stains G10, G11, and G13, Montgomery described the 25 allele as a minor component, compared its band intensity with a one-nanogram control, and said its exact DNA quantity could not be determined
- Defense challenged whether scanned/magnified gel images revealed anomalous band-like activity suggesting a potential 17 allele
- Multiple sidebars arose over demonstrative slides and computer-enhanced photographs used in cross-examination