The plaintiffs presented blood evidence and chain-of-custody testimony from LAPD officials, including serologist Gregory Matheson and criminalist Dennis Fung. However, defense attorney Robert Blasier mounted a systematic and aggressive attack on the LAPD's evidence handling procedures, exposing a suspicious change in blood vial item numbering, a three-day gap in the evidence tracking system, multiple procedural failures by evidence collectors, and evidence that was either missed or not discovered until weeks later. The day laid a foundation for potential tampering allegations.

• Bernie Douroux's prior testimony (tow truck driver) was read in establishing that the Bronco was locked, left unattended for only three minutes, and showed no visible blood.
• Gregory Matheson testified on blood typing and serological analysis, establishing OJ Simpson's blood type matched evidence from the Bundy scene at odds of 1 in 550-570 people.
• Blasier exposed a suspicious change to Simpson's reference blood vial item number from 18 to 17, implying an attempt to conceal when the blood was booked relative to other evidence.
• A three-day gap was established where evidence collected June 13-14 was not entered into the LAPD tracking system until June 16.
• Dennis Fung's testimony began, revealing he had spent 40 hours preparing with plaintiffs' counsel and falsely claimed at grand jury to have personally collected evidence actually collected by untrained trainee Andrea Mazzola.
• Blood on OJ Simpson's dark socks was allegedly invisible and undetected until August 4th, over seven weeks after collection.
• The same item number (116) was used for two different blood samples collected at different times and locations from the back gate.