How have courts dealt with the issue of "exculpatory evidence" in a criminal case?

Appellant also argues the trial court's ruling excluded "exculpatory evidence" in violation of his constitutional right to due process and right to present a defense. We also reject this claim. Where a "trial court's ruling did not constitute a refusal to allow defendant to present a defense, but merely rejected certain evidence concerning the defense," the ruling does not constitute a violation of due process. (People v. Bradford (1997) 15 Cal.4th 1229, 1325.)

We find no error or unfairness.