70
Opinion of the Court
simple plea of not guilty . . . puts the prosecution to its proof as to all elements of the crime charged." Mathews v. United States, 485 U. S. 58, 64-65 (1988). Neither the Court of Appeals nor the parties have given us any reason to think that the rule is different in California. The evidence of battered child syndrome was relevant to show intent, and nothing in the Due Process Clause of the Fourteenth Amendment requires the State to refrain from introducing relevant evidence simply because the defense chooses not to contest the point.
Concluding, as we do, that the prior injury evidence was relevant to an issue in the case, we need not explore further the apparent assumption of the Court of Appeals that it is a violation of the due process guaranteed by the Fourteenth Amendment for evidence that is not relevant to be received in a criminal trial. We hold that McGuire's due process rights were not violated by the admission of the evidence. See Spencer v. Texas, 385 U. S. 554, 563-564 (1967) ("Cases in this Court have long proceeded on the premise that the Due Process Clause guarantees the fundamental elements of fairness in a criminal trial. . . . But it has never been thought that such cases establish this Court as a rule-making organ for the promulgation of state rules of criminal procedure") (citations omitted).
II
The Court of Appeals, however, did not rely solely on a finding that the admission of the evidence was unconstitutional. It based its decision in part on a belief that the instruction given by the trial court, set forth in n. 1, supra, allowed the jury to consider the prior injury evidence for more than simply proof of the battered child syndrome, and thereby violated McGuire's due process rights. McGuire focuses on the portion of the instruction explaining to the jury that the prior injury evidence
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