Portuondo v. Agard, 529 U.S. 61, 13 (2000)

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Cite as: 529 U. S. 61 (2000)

Opinion of the Court

interested-witness instruction, after the defense has closed— is in a long tradition that continues to the present day. See, e. g., United States v. Jones, 587 F. 2d 802 (CA5 1979); United States v. Hill, 470 F. 2d 361 (CADC 1972); 2 C. Wright, Federal Practice and Procedure § 501, and n. 1 (1982). Indeed, the instruction was given in this very case. See Tr. 834 ("A defendant is of course an interested witness since he is interested in the outcome of the trial. You may as jurors wish to keep such interest in mind in determining the credibility and weight to be given to the defendant's testimony").4 There is absolutely nothing to support the dissent's contention that for purposes of determining the validity of generic attacks upon credibility "the distinction between cross-examination and summation is critical," post, at 87.

In sum, we see no reason to depart from the practice of treating testifying defendants the same as other witnesses. A witness's ability to hear prior testimony and to tailor his account accordingly, and the threat that ability presents to the integrity of the trial, are no different when it is the defendant doing the listening. Allowing comment upon the fact that a defendant's presence in the courtroom provides him a unique opportunity to tailor his testimony is appropriate—and indeed, given the inability to sequester the defendant, sometimes essential—to the central function of the trial, which is to discover the truth.

4 It is hard to understand how Justice Stevens reconciles the unquestionable propriety of the standard interested-witness instruction with his conclusion that comment upon the opportunity to tailor, although it is constitutional, "demean[s] [the adversary] process" and "should be discouraged." Post, at 76 (opinion concurring in judgment). Our decision, in any event, is addressed to whether the comment is permissible as a constitutional matter, and not to whether it is always desirable as a matter of sound trial practice. The latter question, as well as the desirability of putting prosecutorial comment into proper perspective by judicial instruction, are best left to trial courts, and to the appellate courts which routinely review their work.

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