Does multiple representation violate the Sixth Amendment?

Holloway reaffirmed that multiple representation does not violate the Sixth Amendment unless it gives rise to a conflict of interest. See 435 U.S., at 482 (, 98 S.Ct., at 1177). Since a possible conflict inheres in almost every instance of multiple representation, a defendant who objects to multiple representation must have the opportunity to show that potential conflicts impermissibly imperil his right to a fair trial. But unless the trial court fails to afford such an opportunity, a reviewing court cannot presume that the possibility for conflict has resulted in ineffective assistance of counsel.

Cuyler v. Sullivan, supra, 446 U.S. at 348, 100 S.Ct. at 1718.