Defense attorney Barry Scheck conducted a devastating cross-examination of LAPD criminalist Dennis Fung, systematically exposing contradictions between his testimony and crime scene videotape evidence, gaps in his DNA training, and major inconsistencies in chain of custody documentation. Videotape evidence proved Fung's timeline testimony false—showing evidence collection occurring while the coroner's staff was still present. The day featured multiple procedural battles over videotape admissibility, with the court restricting some segments but allowing the most damaging contradictions through.

• Crime scene videotape directly contradicts Fung's testimony that evidence collection began after coroner's staff left—shows coroner's assistant present during Mazzola's glove collection
• Scheck questions Fung's brief pre-1994 and on-the-job DNA evidence-collection training and identifies subjects his recalled instruction had not covered
• Scheck questions Fung about LAPD's use of plastic bags and passages from forensic texts
• Sock measurements are transposed between Fung's field notes and official evidence collection sheet
• An unidentified B.A.D. detective opened the Bronco with a slimjim on June 14th and left no record of his presence
• Blood drops at the rear gate were not collected on June 13th but appeared on July 3rd
• Fung testifies that he detected no blood in numerous specified areas of Simpson's Rockingham residence and that the master-bedroom sink-trap presumptive test was negative