Cite as: 504 U. S. 127 (1992)
Thomas, J., dissenting
A
Riggins first argued that the trial court improperly prevented him from presenting relevant evidence of his demeanor. As the Court notes, Riggins suffers from a mental illness and raised insanity as a defense at trial. When Rig-gins killed Wade, he was not using any antipsychotic medication. During his trial, however, Riggins was taking large doses of the antipsychotic drug Mellaril. Riggins believed that this drug would make his appearance at trial different from his appearance when he attacked Wade and that this difference might cause the jury to misjudge his sanity. To show his mental condition as it existed at the time of the crime, Riggins requested permission to appear before the jury in an unmedicated state. App. 20-24, 42-47. The trial court denied the request, and the Nevada Supreme Court affirmed.
This Court has no power to decide questions concerning the admissibility of evidence under Nevada law. Estelle v. McGuire, 502 U. S. 62, 67-68 (1991). We therefore may conduct only a limited review of a Nevada court's decision to exclude a particular form of demeanor evidence. Except in cases involving a violation of a specific constitutional provision such as the Confrontation Clause, see, e. g., Ohio v. Roberts, 448 U. S. 56 (1980), this Court may not reverse a state "trial judge's action in the admission of evidence" unless the evidentiary ruling "so infuse[s] the trial with unfairness as to deny due process of law." Lisenba v. California, 314 U. S. 219, 228 (1941). See also Marshall v. Lonberger, 459 U. S. 422, 438, n. 6 (1983); Burgett v. Texas, 389 U. S. 109, 113-114 (1967). In this case, I see no basis for concluding that Riggins had less than a full and fair trial.
The Court declines to decide whether Mellaril actually affected Riggins' appearance. On the basis of some pretrial psychiatric testimony it speculates only that Riggins might have looked less uptight, drowsy, or confused if he had not taken the drug. Ante, at 137. Other evidence casts doubt
147
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