Donald Thompson was an LAPD officer who responded to both the Bundy and Rockingham scenes on June 13, 1994, and handcuffed Simpson on Detective Vannatter's instruction — a decision he stood by under cross-examination by Christopher Darden. Called by the defense, his testimony became a vehicle for attacking police procedures: Johnnie Cochran's direct examination highlighted Thompson's lack of protective gear, his movement between the two crime scenes, and gaps in documentation, all aimed at establishing contamination risks that could undermine the physical evidence.