Fuhrman is a good detective. Had the prosecutors been more competent, they would have called his partner who would verify what Fuhrman said about OJ.
I never did figure out why they didn't call Fuhrman's partner, who BTW is black. (Another goof by Marcia Clark.) Nobody mentioned that on Fuhrman's own time, he found proof that a black who was charged with a crime was in fact not guilty. Doesn't sound racist to me.