The day centered on FBI forensic chemist Roger Martz's EDTA testing—a critical proxy for the defense's contamination theory. Defense attorney Blasier attacked Martz's credentials and methodology, while prosecutor Clark rehabilitated him by demonstrating clear EDTA signals in reference blood but not evidence blood. The lengthy technical examination pit the defense contamination theory directly against prosecution evidence integrity, with both sides emphasizing what defense experts did and did not experimentally validate. A glove shrinkage motion hearing concluded the proceedings.

• Defense witness Dr. Fredric Rieders departed for medical appointment, interrupting cross-examination until Friday.
• FBI chemist Roger Martz faced intensive cross-examination on EDTA testing methodology and limited academic credentials.
• Prosecutor Marcia Clark rehabilitated Martz by demonstrating clear EDTA signals in reference blood but absence in evidence blood.
• Clark challenged why defense experts Rieders and Ballard possessed equipment to conduct EDTA validation experiments but never did.
• Court partially admitted glove shrinkage experiment evidence while excluding subjective wetness/dryness appearance testimony.