Day 122 was consumed by intense examination of FBI chemist Roger Martz's EDTA testing methodology for blood evidence from the sock and back gate. The defense systematically dismantled the scientific foundations of Martz's conclusion that EDTA was not present, exposing destroyed data, undocumented procedures, and fundamentally flawed quantification methods. Martz's credibility deteriorated visibly—he admitted conducting experiments 'for dramatic effect' and couldn't recall the value of pi. The prosecution attempted rehabilitation on recross, but the damage was substantial.

• Defense granted motion to treat FBI Agent Martz as hostile witness
• Clark established critical distinction between 'detecting' versus 'identifying' EDTA compounds
• Blasier exposed that Martz destroyed raw mass spectrometry data for key evidence samples
• Martz admitted conducting an 'informal dilution experiment' 'for dramatic effect' with no documentation
• Martz could not recall the value of pi, prompting judicial intervention and damaging his credibility as forensic expert
• Defense demonstrated metal-to-metal ion count variance was approximately 14-fold, contradicting prosecution charts claiming 1000-fold difference
• Multiple sidebars erupted over exhibit admissibility and chart methodology
• Martz conceded he never attempted larger blood quantity tests despite suspecting EDTA might be present