 Therefore, although the prosecution ordinarily may insist on proving its case via narrative evidence, Rule 403 allows the defendant to stipulate to prior convictions in order to avoid the unfair prejudice that would result from the prosecution introducing the facts of that prior crime into evidence during the later prosecution.Justice O'Connor contested the majority opinion, which held that introducing the facts of a defendant's prior conviction could be "unfairly" prejudicial.After all, Congress had made the fact of a prior conviction an element of the crime of being a felon in possession of a firearm.