Mickens v. Taylor, 535 U.S. 162 (2002) (Supreme Court of the United States)
Mickens v. Taylor is a cornerstone Sixth Amendment case at the intersection of effective assistance of counsel and attorney conflicts of interest.
Does a trial court's failure to inquire into a potential conflict of interest—when the court knows or reasonably should know that a particular conflict may exist—require automatic reversal of a conviction, or must a defendant show that an actual conflict adversely affected counsel's performance to obtain relief under the Sixth Amendment?
Sixth Amendment conflict-of-interest doctrine distinguishes among: (1) Holloway v. Arkansas: if a trial court improperly requires joint representation over a timely objection, reversal is automatic; (2) Cuyler v. Sullivan: if no objection was made, a defendant must show that counsel actively represented conflicting interests and that the conflict adversely affected the lawyer's performance; upon that showing, prejudice is presumed and the conviction must be reversed without further proof of Strickland prejudice; and (3) in all other ineffective-assistance claims, the two-prong Strickland v. Washington test applies (deficient performance and a reasonable probability of a different outcome). Mickens clarifies that a trial court's failure to inquire into a potential conflict is not itself a Sixth Amendment violation and that the Sullivan presumption at minimum requires proof of an actual conflict that adversely affected performance; the Court declined to extend Sullivan beyond concurrent multiple representation and left open whether it applies to other conflict types, such as successive representation.
No automatic reversal. A trial court's failure to inquire into a potential conflict is not, standing alone, a basis for setting aside a conviction. Relief requires a showing that an actual conflict of interest adversely affected counsel's performance within the meaning of Cuyler v. Sullivan. The Court affirmed the denial of habeas relief because Mickens failed to establish adverse effect from the alleged conflict.
Mickens narrows the path to relief for conflict-of-interest claims by: (1) refusing to treat a trial court's failure to inquire as structural error; (2) reaffirming that, absent a timely objection under Holloway, defendants must prove an actual conflict that adversely affected performance to obtain the Sullivan presumption; and (3) declining to extend Sullivan beyond concurrent multiple representation, leaving unresolved whether successive-representation conflicts qualify for presumed prejudice. For law students, the case is essential to understanding the tiers of Sixth Amendment conflict analysis, the evidentiary showing required to establish adverse effect, and the practical importance of contemporaneous objections and record-making on potential conflicts.