Criminalist Andrea Mazzola's testimony dominated the entire day, with prosecutor Hank Goldberg conducting direct examination and defense attorney Peter Neufeld beginning cross-examination that devastated her credibility. The testimony exposed a critical contradiction: Mazzola previously testified under oath that she personally collected all blood samples at Rockingham, but now attributed key items to Dennis Fung—a shift that occurred after a private meeting with Fung following her August 1994 deposition. Multiple documentation errors, chain-of-custody gaps, and the revelation that Mazzola was an unprepared probationary trainee with no prior crime scene experience severely compromised the foundation of the prosecution's physical evidence case.

• Mazzola testified she was called to prior hearing with no preparation, handed a colleague's notes as she entered the courtroom
• Videotape evidence corrected multiple errors from her prior Griffen hearing testimony about collection sequence and timing
• Crime scene documentation revealed erasures on official forms and evidence items renumbered at Fung's direction for administrative convenience
• Cross-examination exposed direct contradiction: Mazzola previously testified she collected all blood at Rockingham; now attributes items 4, 5, 6 to Dennis Fung
• Neufeld established no videotape, photograph, or contemporaneous document supports that Fung collected any blood at Rockingham
• Mazzola's changed account emerged after a private post-deposition meeting with Dennis Fung where they 'compared conflicting recollections'
• Revealed Mazzola was a probationary trainee with zero prior crime scene experience when she worked the Simpson scene
• Multiple chain-of-custody gaps confirmed: missing initials on coin envelopes, documentation inconsistencies, and evidence collection procedures questioned throughout