Day one of the preliminary hearing focused on evidence handling and forensic standards. Judge Kennedy-Powell mediated disputes over hair sample quantities (ordering no more than 10 hairs for now) and established evidence logistics. The testimony of LAPD lab director Michele Kestler on testing protocols sparked aggressive cross-examination from defense counsel Shapiro, who attacked her credentials and documented remaining samples across 60+ blood evidence items.

• Judge Kennedy-Powell orders no more than 10 hairs for now, compromising between prosecution (roughly 100 needed) and defense (1-3 sufficient) arguments
• LAPD Assistant Laboratory Director Michele Kestler testifies on evidence items, blood splits, and scientific standards for forensic samples
• Shapiro attacks Kestler's credentials and DNA training background during aggressive cross-examination
• Discovery issue surfaces: Defense has not received witness's curriculum vitae; cross-examination paused until resolved
• Defense logistics were discussed in chambers; Shapiro received an early excusal because his best friend's father had died and he wanted to attend the ceremony.