The day centered on FBI forensic chemist Roger Martz's EDTA testing. Defense attorney Blasier challenged Martz's credentials and methods, and Martz acknowledged that the sock and gate results were consistent with the presence of EDTA while disputing several proposed methodological conclusions. On redirect, Marcia Clark elicited Martz's testimony that reference blood produced identifiable EDTA signals while the rear-gate and sock samples did not, and Martz disagreed with Dr. Rieders's interpretation of the sock graph. 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 direct examination by defense attorney Robert Blasier on EDTA testing methodology and limited academic credentials.
• On redirect, Martz testified that reference blood produced identifiable EDTA signals while the rear-gate and sock samples did not.
• 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.