Det. Bert Luper was a 23-year LAPD veteran assigned to the robbery/homicide division who joined the Simpson investigation on the morning of June 13, 1994, working the case alongside Detectives Lange and Vannatter. Called as a defense witness by Johnnie Cochran, Luper's single day of testimony proved damaging to the prosecution's evidence-handling narrative — he revealed that a brown glove found at the Simpson residence had been improperly moved before being photographed, feeding the defense's broader argument that critical evidence was mishandled at Rockingham. His testimony was part of a coordinated defense strategy that day, paired with witnesses who challenged everything from the documentation of socks in Simpson's bedroom to the security of the Bronco at impound.