Day 81 was dominated by LAPD DNA analyst Collin Yamauchi's extensive direct examination, where prosecutor Harmon meticulously walked the jury through PCR testing procedures and evidence handling protocols. The proceeding took a tense turn when Yamauchi admitted he expected Simpson to be excluded based on news reports of an alibi in Chicago—raising critical examiner bias questions. Multiple disputes erupted over demonstrative exhibits' accuracy, discovery obligations for defense expert reports, and the reliability of DNA typing strips, while Yamauchi's testimony showed glove stains mostly inconclusive and Bundy samples matching Nicole Brown.

• LAPD analyst Yamauchi admits expecting Simpson to be excluded before testing, based on news reports of alibi in Chicago
• Defense challenges accuracy of prosecution's PCR lab board, claiming it shows cleaned-up rather than actual lab configuration
• Dispute erupts over Dr. Gerdes expert report discovery—defense provided only six pages of notes two days before Yamauchi testified
• Judge Ito orders coverage of 'Same gloves' notation on socks examination board after Scheck challenges its accuracy
• Yamauchi's PCR results: glove stains 9A/9B inconclusive, 9C/9D show mixture that cannot exclude Simpson; Bundy samples all match Nicole Brown
• Sidebar debate over whether Yamauchi's awareness of Simpson's alleged alibi constitutes impermissible examiner bias
• Defense objects to prosecution's use of DQ-Alpha typing strips without C dot, citing lack of scientific foundation for interpretation