"Devastating to the prosecution’s case was Mr. Fuhrman’s turn as a witness — specifically his repeated past use of a racial epithet that he initially denied having uttered."

"That denial was shown to be untrue when the Simpson defense team introduced audiotapes of him using the word dozens of times. Mr. Fuhrman then acknowledged having used such language, but said it was in the context of creating a screenplay that he hoped would become a movie. Other trial witnesses testified that Mr. Fuhrman had indeed used the word in earnest; one of them recalled his having said that if it were up to him, Black people 'would be gathered together and burned.' On the tapes, he was heard saying that there were police officers who 'would just love to take certain people and just take them to the alley and just blow their brains out.'"

From "Mark Fuhrman, Flawed Witness in O.J. Simpson Trial, Dies at 74/A Los Angeles police detective, he was discredited during Mr. Simpson’s 1995 murder trial by defense lawyers who pointed to his past use of racist language" (NYT).