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Opinion of the Court
under oath." Id., at 485-486 (internal quotation marks omitted). Holloway presumed, moreover, that the conflict, "which [the defendant] and his counsel tried to avoid by timely objections to the joint representation," id., at 490, undermined the adversarial process. The presumption was justified because joint representation of conflicting interests is inherently suspect, and because counsel's conflicting obligations to multiple defendants "effectively sea[l] his lips on crucial matters" and make it difficult to measure the precise harm arising from counsel's errors. Id., at 489-490. Holloway thus creates an automatic reversal rule only where defense counsel is forced to represent codefendants over his timely objection, unless the trial court has determined that there is no conflict. Id., at 488 ("[W]henever a trial court improperly requires joint representation over timely objection reversal is automatic").
In Cuyler v. Sullivan, 446 U. S. 335 (1980), the respondent was one of three defendants accused of murder who were tried separately, represented by the same counsel. Neither counsel nor anyone else objected to the multiple representation, and counsel's opening argument at Sullivan's trial suggested that the interests of the defendants were aligned. Id., at 347-348. We declined to extend Holloway's automatic reversal rule to this situation and held that, absent objection, a defendant must demonstrate that "a conflict of interest actually affected the adequacy of his representation." 446 U. S., at 348-349. In addition to describing the defendant's burden of proof, Sullivan addressed separately a trial court's duty to inquire into the propriety of a multiple representation, construing Holloway to require inquiry only when "the trial court knows or reasonably should know that a particular conflict exists," 446 U. S., at 347 2—which is not
2 In order to circumvent Sullivan's clear language, Justice Stevens suggests that a trial court must scrutinize representation by appointed counsel more closely than representation by retained counsel. Post, at 184 (dissenting opinion). But we have already rejected the notion that
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